石油实验地质

TAKING A VIGOROUS ACTION TO EXPLORATION OF INORGANIC-SOURCED HYDROCARBON

Chen Husheng

1998, 20(1): 1-5. doi: 10.11781/sysydz199801001

Abstract(796) PDF-CN(384)

Abstract:
There may be much more hydrocarbon in inorganic-sourced domain than in organic-sourced domain.Conditions for accumulation of inorganic-sourced hydrocarbon are as follows: (1)large deep fault to lithosphere as migration path; and (2)the hydrocarbon was not oxidated in process of migrating to crust surface. The accumulation pattern was suggested in accordance with above conditions and lithospheric structure: (1) traps in rift system or rift basin with thick sediments of reducing environment, which mixed with organic hydrocarbon; and (2) residuals of lifted horizontal zone of fracture neighbering rift basin. The prospects of inorganic hydrocarbon and their exploration method were indicated.

SOME PR0BLEMS IN EXPLORATION AND DEVELOPMENT OF COAL-SEAM METHANE IN CHINA

Liu Zeying, Mu Qing

1998, 20(1): 6-9. doi: 10.11781/sysydz199801006

Abstract(605) PDF-CN(369)

Abstract:
Some urgent scientific and technical problems should be solved related to exploration and development of coal bed methane were discussed and future objective for scientific and technical development was suggested in the paper. Some research projects concerning coal bed methane were proposed.

PETROLEUM GEOLOGICAL CHARACTERISTICS AND HYDROCARBON-BEARING PROSPECT EVALUATION OF THE MINHE BASIN

Zhang Huquan

1998, 20(1): 10-13. doi: 10.11781/sysydz199801010

Abstract(592) PDF-CN(464)

Abstract:
Based on the early systematical petroleum geogical comprehensive study and secondary resource evaluation, the petroleum geological characteristics and essential petroleum geologic conditions of the Minhe Basin are summarized, and the good hydrocabon-bearing prospect of the Basin is displayed.

FORMATI0N PATTERN OF OIL-GAS POOLS AND DISTRIBUTION OF HYDROCARBON IN GAOQING AREA

Jiang Youlu, Rong Qihong

1998, 20(1): 14-19. doi: 10.11781/sysydz199801014

Abstract(739) PDF-CN(331)

Abstract:
The formation pattern and distribution characteristics of oil-gas pools were discussed on the basis of geological data from Gaoqing oil field.It was pointed out that there were some distinct features for the formation of oil-gas pools and various reserviors in the study area, and different structural units had distinct patterns for formation of oil-gas pools. The distribution of oil and gas was mainly controlled by Gaoqing fault and mudstone caprock of Guantao formation.

GEOTHERMAL FIELD AND MATURING HISTORY OF ORGANIC MATTER IN THE ORDOS BASIN

Zhou Jiangyu, Wu Chonglong, Han Zijun

1998, 20(1): 20-24. doi: 10.11781/sysydz199801020

Abstract(659) PDF-CN(476)

Abstract:
On the basis of present geothermal gradient and vitrinite reflectance in the Ordos basin, present geothermal flux was inversed. According to characteristics of paleo-and present geothermal field of the basin, the infleuntial factors were analysed in statistic way and properties of the main infleuntial factors were pointed out. In accompanying with study of tectono-depositional evolution,maturing history of organic matter in different stages and areas of the basin were analysed.

SEQUENCE STRATIGRAPHY AND SEDIMENTORY EVOLUTION OF THE MIDDLE JURASSIC IN NORTHERN CHAOSHUI BASIN

Ge Lingang, Chen Zhonghui, Wu Fadong, Zhang Zhihong, Xu Tailun

1998, 20(1): 25-29. doi: 10.11781/sysydz199801025

Abstract(677) PDF-CN(384)

Abstract:
On the basis of systematic analysis of outcrops, well cores, log and seismic stratigraphy, the stratigraphic sequence of the Middle Jurassic in northern Chaoshui basin was divided into 4 third-order sequences and 2 second-order sequences. According to depositional system and sedimentary evolution analysis, it was indicated that the prevenance changed rapidly and the sedimentary style varied from one thirdorder sequence to another, The variation of prevenance with time reflected tectonic control.

“SEISMIC DATA INTERPRETATION TECHNOLOGY FOR COMPLEX REGIONS” AND ITS APPLICATION IN THE TANGYUAN FAULT DEPRESSION

Luo Qun, Bai Xinhua, Zhang Shulin

1998, 20(1): 30-38. doi: 10.11781/sysydz199801030

Abstract(574) PDF-CN(342)

Abstract:
Complex geologic structure and strong facies change are the major features of continental fault depression basins. Such features often have great effect on the quality of seismic data, and bring about much dif ficulty in the correct interpretation of seismic data. Besides, the amount of fault interpretation models, the difference of geological views and the experience of interpretation also result in different interpretation from different interpretation persons for the same region. Based on the extensive investigation of continen tal fault depression basins, the authors sum up the interpretation experience of predecessors and establish "the seismic data interpretation technology for complex regions' in accordance with the features of continental fault depression basins by means of nthe equilibrium geologic sectionn and other theoretical ways. This technology has important guiding significance for the reduction of man-made factors and the elimination of multisolution interpretation in order to interpret seismic data more reasonably.

DISCOVERY AND CHARACTERISTICS OF HIGH-MINERALIZED SODA-DICARBONATE-TYPED WATER IN KARAMAY OIL REGION

Wang Zhonghou, Zhang Shujun

1998, 20(1): 39-43. doi: 10.11781/sysydz199801039

Abstract(818) PDF-CN(336)

Abstract:
The NaHCO₃-typed water with the degree of mineralization up to 150g/L which is most highly mine ralized formation water in the Junggar Basin so far is discovered in the Carboniferous, the Permian and the Lower Triassic strata of the Fengcheng oil Field and the North Karamay Oil Field in the Karamay oil region on the northwest edge of the Junggar Basin. The first chemical characteristic of water is high boron (B) content up to 1700-2300mg/L which has not been reported at home and abroad. The second one is very high CO₃^2-+HCO₃^- content which makes up 56%～88% of the total anion content in the water. Of which, the CO₃^2- content is up to 31-39g/L, HCO₃^- content to 14～36g/L, and the re1evant Ca²⁺ and Mg²⁺ contents are all less than 0.1g/L. The crude oil produced simultaneously with high-mineralized NaHCO₃-typed water has greater change with density of 0.789～0.895g/cm³. This high pressure water rises from within along faults and is mixed with early formed CaCl₂-typed water to result in middle-high mineralized Na₂SO₄-typed water which is seen in the paleo-edge-water region of the Permian and Triassic oil accumulation in No.8 area. The high-mineralized NaHCO₃-typed water is inferred to generate when high pressure and high concentration CO₂ gas of unknown genesis comes into water in the deep of the crust. The distribution of discovery points suggests that it may have something to do with the deep buried faults and is consistent with the distribution of light crude oil (with density 0.84g/cm³) on the whole.

1998, 20(1): 43-43. doi: 10.11781/sysydz199801043

Abstract(572) PDF-CN(288)

Abstract:

THE CARBONIFEROUS OIL/WATER DISTRIBUTION AND ASSESSMENT OF HYDROCARBON POTENTIAL IN SHIXI OILFIELD

Wang Yutao

1998, 20(1): 44-48. doi: 10.11781/sysydz199801044

Abstract(724) PDF-CN(323)

Abstract:
There is obvious pattern for oil/water distributiaon in the Carboniferous volcanic reserviors of Shixi oil-field. The specific gravity of crude oil increase towards the north and it is not controlled by structures. It is different in east and west blocks for characteristics of formation water. Water with low salinity is distributed in the west block and the gradient of ionic concentration is from south t0 north; and water with high salinity is distributed in the east block and the gradient of ionic concentration is from west to east. It is suggested that migrati0n direction of oil and formation water was from south to north and the fault in the middle of the reservi0r was a main factor in influencing distribution of formation water and hydrocarbon abundance.

TECTONIC-THERMAL MODELING OF RIFTING BASIN

Zhang Gongcheng, Xu Hong, Zhou Zhangbao, Cai Xiyuan, Jin Li

1998, 20(1): 49-54. doi: 10.11781/sysydz199801049

Abstract(708) PDF-CN(649)

Abstract:
Forward modeling of balanced cross section has become a basic technique for hydrocarbon explorationThe technique can check various hypotheses rapidly and give out a reasonable model for interpretation. It can also demonstrate the deformation history dynamically and provide evidence of formation and evolution of hydrocarbon. The subsidence history of rifting basin can be divided into 3 periods, i. e. rifting stage, postrifting stage and inverted stage. The extensional ratio can be used to calculate thermal flow, which can predict the petroleum potential.0 Daqing Research Institute 0f Petroleum Explorati0n Development, Daqing l637120 Zhongyuan Research Institute of Petroleum Fxploration Development, CNPC0 Daqing Research Institute of Petroleum Exploration DeveIopment, Daqing l637l2

DYNAMIC FORECAST AND ECONOMIC ANALYSIS OF OIL AND GAS RESOURCES

Liu Yi, Liu Min, Chen Qianglu

1998, 20(1): 55-60. doi: 10.11781/sysydz199801055

Abstract(557) PDF-CN(267)

Abstract:
The probability statistical theory and stochastic sampling modeling technology are used to establish an exploration process modeling method and dynamically study the relationship between the discovery of resource amount and the work load of exploration during the exploration of oil and gas. This method can forecast the resource amount of a prospect area, the scale and possible number of oil and gas pools, and the expioration work load, cost and effect for some resource. These information will be helpful for the further exporation and development of oil and gas in the prospect area.

QUANTITATIVE RESERVOIR SEDIMENTOLOGY AS AN IMPORTANT WAY TO OBTAIN GEOLOGICAL INFORMATIN FOR RESERVOIR MODEL ESTABLISHMENT：A CASE STUDY ON THE OUTCROP OF YOUSHASHAN IN QINGHAI PROVINCE

Lei BianJun, Zhang Changmin, Lin Kexiang, Liu Huaibo, Qu Pingyan, Ma Wenxiong

1998, 20(1): 61-67. doi: 10.11781/sysydz199801061

Abstract(666) PDF-CN(386)

Abstract:
Taking the study on the outcrop of Youshashan in Qinghai Province for example, this paper expounds from five aspects in different level that Quantitative Reservoir Sedimentology is an important way to obtain geological information for reservoir model establishment: (1) the sedimentary system and microfacies analyses are the bases for understanding the macrofeature of reservoirs; (2)the size, geometry, orientation and internal anisotropism of sand body are known by sand body measurement; (3)the connexion and area ratio of sand body can be determined by mosaic photoes combined with close columnar sections; (4) the analyses on the development stage of each type of sand body and its lithology provide bases for reservoir evaluation; and (5) the study of diagenesis and pore structure reveals the microanisotropism of reservoirs.

PETROLEUM GEOCHEMICAL ANALYSIS ON THE CIRCULAR ANOMALY OF REMOTE-SENSING IMAGES IN GOBI REGIONS

Yu Qixiang, Tan Qing, Zeng Huasheng, Bi Lanying, Yuan Yusong

1998, 20(1): 68-74. doi: 10.11781/sysydz199801068

Abstract(678) PDF-CN(293)

Abstract:
The comprehensive study on the petroleum geochemical exploration and remote-sensing survey of some northwest desert region has suggested that: (1) in the twelve circular images interpreted on the basis of remote-sensing images, hue anomaly is dominant, image texture anomaly takes the second, and the images are characterized by light yellow, orange and purplish red hue; (2) factor and cluster analyses of data from joint determination of geochemical prospecting and object spectrum on the No. 7 circular image(R,) area and the adjacent regions show that R, is actually a anomalous halo produced by the alteration of hy-drocarbons, and a parameter well drilled in 1995 near R₇ area produced commercial oil flow F (3) statistics also reveal that the average values of C₂,C₃,C₂^-,△C, Hg and other indexes in most circular image anomalies are higher than the regional background value; (4) rank correlatio coefficients indicate that the most similar to R₇ is R₈, then is R₉,R₃,R₄,R₁,R₆ and R₁₂, Successively. All the circular image anomalies mentioned above probably result from the alteration of oil and gas, and are worth paying attention to.

DISCUSSION ON THE ANOMALOUS MORPHOLOGICAL TYPES AND THE IR GENESES OF UPPER GEOCHEMICAL EXPLORATION FOR OIL AND GAS ACCUMULATION

Tang Yuping, Ding Xiangyu, Gong Weiqi

1998, 20(1): 75-79. doi: 10.11781/sysydz199801075

Abstract(563) PDF-CN(328)

Abstract:
The summary on the anomalous morphological types of upper geochemical exploration for typical oil and gas accumulation in North Tarim, Ordos, Songliao and other regions shows that the basic type of the upper anomaly of oil and gas accumulation is a ring. Generally, the range of ring-like anomaly corresponds to oil and gas regions, and the ring-like belt of high value indicates an oil-water boundary.It is shown by ressearch that fabric anomaly is prior to index content anomaly in the corresponding relationship to a given region and the continuity and natural curved morphology of ring-like anomaly. The ring-like anomaly may reflect the strongest hydrocarbon leakage in the margin of oil and gas fields. The fact that the hydrocarbon concentration and migratory gradient of marginal wells are notably high to those of oil and gas wells and peripheral wells also shows that there are high hydrocarbon-leaching regions related to the development of microfissure system and the mobility and high-dissolved hydrocarbons of edge water in oil-water boun dary.

COMPREHENSIVE EVALUATION OF SEALING ABILITY OF MUDSTONE CAPROCK

Fu Guang, Chen Zhangming, Lü Yanfang, Lu Liansheng

1998, 20(1): 80-86. doi: 10.11781/sysydz199801080

Abstract(794) PDF-CN(445)

Abstract:
The displace pressure difference between caprock and reservior, abnormal pore fluid presure, abnor mal gas-bearing c0ncentration, sealing ability of faults, thickness of mudstone, and depositional environment were choosed as parameters in evaluating the microcosmic sealing ability and macroscopic distrlbution of mudstone caprocks. By grading and weighting of the parameters, in accordance with their development and efficiency, the weight for comprehensive evaluation of sealing ability of mudstone caprock was calculated by weighted average method. It was applied to evaluate the sealing ability of mudstone caprock in member N2 of Daqing placanticline and the area to its west. The result was consistent to the actual geological conditions in the region. It indicated that the method was practical for evaluation of mudstone caprock.

APPLICATION OF SOLUBLE EXTRACT MICROFLUORESCENCE IN SOURE ROCK TO THE CLASSIFICATION OF ORGANIC TYPES

Li Peizhen, Zhang Xuejun, Wang Lihua, Liu Qing

1998, 20(1): 87-91. doi: 10.11781/sysydz199801087

Abstract(635) PDF-CN(314)

Abstract:
The microfluorometric analysis of soluble organic matter from four standard samples and four modern organism and natural section samples in this paper shows that heax moves towards the long-wave direction with the increase of aromatic ring numbers in the fluorescence of standard samples. The spectrum peaks of pIant plankton, Ulva and other hydrobios are in the blue area, and those of Sargassum and other genobenthos are in the red area. By meang of the correlation diagram of chloroform "A"λ Anax to kerogen sapropels combined with the difference of promal organic mater, the types of source rock can be classified.

APPLICATION OF FREE RADICAL CONCENTRATIoN OF KEROGEN TO PALEOGEOTHERMAL MEASUREMENT

Qiu Nanshen, Wang Jiyang

1998, 20(1): 92-94. doi: 10.11781/sysydz199801092

Abstract(590) PDF-CN(341)

Abstract:
The free radical concentration (Ng) of kerogen is a valid index to study thermal maturation of organic matter and paleotemperature of sedimentary basin. A standard curve map was established to estimate paleothermal gradients based on the relationship between Ng and buried depth of kerogen samples from the Cenozoic basin. The paleo-geothermal gradients of well MC1, the Tarim basin and well LR16, the Liaohe basin were estimated by using the stardard curve. It gived a new way to study paleo-temperature in an area where vitrinite grain can not be found and apatite fission track analysis can not work because of lack of a patlte.

CHARACTERISTIC ANALYSES OF OIL AND GAS EVIDENCES IN THE XIAOWUJIAZI OIL AND GAS FIELD

Chen Jianfei

1998, 20(1): 95-97. doi: 10.11781/sysydz199801095

Abstract(670) PDF-CN(233)

Abstract:
In the paper,gas and geological logging data are applied to analyze and summarize the characteristics of oil and gas evidences in the Xiaowujiazi Oil and Gas Field in order to find a general rule. It is aIso pointed out that the oil and gas showing indexes of this Field can also be used in the boring logging and de velopment of oil and gas (mainly natural gas) in the similar oil and gas fields.

A NEW CALCULATION METHOD FOR HYDROCARBON GENERATION AND DISCHARGE AMOUNT IN GEOCHEMICAL LOGGING

Xiao Lihua, Meng Yuanlin, Gao Daling, Hao Cuijuan, Li Hong, Hou Chuangye

1998, 20(1): 98-102. doi: 10.11781/sysydz199801098

Abstract(528) PDF-CN(408)

Abstract:
By comprehensive consideration over the effect of diagenetic compaction and organic matter thermalevolution and types,a new organic carbon recovery model is established in this paper on the principle thatthe absolute content of unavailable carbon in kerogen remains constant in the pr0cess 0f hydrocarbon generation. On this basis, a calculation formula about hydrocarbon generation and discharge amount fit for geochemical logging is obtained to make the whole calculation process more correct and efficient than for mer illustration method. This new method has been applied successfully in geochemical logging to the offshore, subaerial and peripheral basins of the Liaohe Oil Field. In this paper, only one well in the TielingBasin is taken for example to explain the application of this method.The geochemical log of Dichang 2 well in the Tieling Basin shows that its hydrocarbon generation intensity is 263. 794×10⁴t/km²,its hydrocarbon discharge intensity is 138. 166×10⁴t/km² and its resource density is 13. 190×10⁴t/km². All these have come up to the hydrocarbon-generating intensity standard for Ⅰ-typed oil and gas basins of our country.The Changtu Depression has more sufficient source of oil and gas, and is hoped to form some middle and small scale of oil and gas fields. The next exploration program is mainly to find traps and favorable reservoirs.

1998 Vol. 20, No. 1

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