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1986 Vol. 8, No. 3

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APPLICATION OF TLC/FID GROUP COMPOSITIONAL ANALYSIS OF MICRO-AMOUNTS OF EXTRACT
Yu Zhiqing
1986, 8(3): 193-198. doi: 10.11781/sysydz198603193
Abstract(677) PDF-CN(336)
Abstract:
There are certain limitations in present column chromatography for the group compositional analysis of extract.In order to get it improved, a new method which combines Thin Layer Chromatography(TLC)with hydrogen Flame Ionization Detector(FID)was adopted.TLC sintered bar is coated with silica gel or alumina as absorbent. After repeated chromatographic developments, the bar moves through flame detector at a constant rate, and each component is automatcally scanned. This method is quick,precise and especially applicable to the analysis of carbonate rock sample with low extract content. Furthermore, because TLC bar has been burnt on hydrogen flame, the absorbent is reactivated, so that it needn't to be recoated. The sintered bar can be repeatedly used for about 50-100 times.
CUTTING-GAS ANALYSIS
Jiang Meixian, Chen Weijun
1986, 8(3): 199-204. doi: 10.11781/sysydz198603199
Abstract(613) PDF-CN(309)
Abstract:
For analysing cutting-gas, the authors designed and set up a degassing apparatus that agitates and crushs cuttings. It is used together with HP-5880 GC for qualitative and quantitative determinations of cutting-gas. Through experiments under various conditions, the performance of the apparatus has bee a proved to be good for rock sample crushing and degassing. The method employed is reliable and the data obtained are comparable to each other.During experiments, optimum operation conditions were selected and determined: (1) grain size of rock sample. 2-8mm; (2) the amount of rock sample: 10-15g; (3) agitating medium: distilled water; (4)agitating time. 8 minutes; (5) top volume of degassing cylinder: 5-9ml; (6)balance time for diffusion. 5 minutes.
THE PALEOHYDROGEOLOGICAL CONDITION AND THE MIGRATION-ACCUMULATION OF OIL AND GAS IN JIYANG DEPRESSION
Yang Xuchong
1986, 8(3): 205-214. doi: 10.11781/sysydz198603205
Abstract(588) PDF-CN(376)
Abstract:
The paleohydrogeological condition and its relationship to the migration and accumulation of oil and gas in Jiyang Depression are studied with the cyclic standpoints. Depending on the hydrogeological cycles, the Cenozoic (K2) in this area can be divided into Eocene (E2), Oligocene (E3) and Nogene(N)-Quaternary(Q). Each cycle can be divided into two hydrogeological stages of sedimentation and seeping. The water-exchanges of Shahejie Formation (except Es4) are evaluated. The result shows the activity of deposition water is far exceeded than that of seeping water. This condition is quite favourable for migration, accumulation and preservation of oil/gas. The prospects of oil and gas in this area are evaluated in accordance to the paleohydrodynamic effects, and the time, trend and size of migration and accumulation of oil/gas are discussed as well.
STUDY ON THE SOURCE OF NATURAL GAS IN JIZHONG DEPESSION
Wang Xueping, Fei Baosheng
1986, 8(3): 215-223. doi: 10.11781/sysydz198603215
Abstract(571) PDF-CN(260)
Abstract:
Along distribution zone of natural gas fields in Jizhong Depression, the composition, carbon isotopes, argon isotopes, and mercury content of the natural gas are discussed. It is suggested that the natural gas in Ji/hong Depression is associated gas which would serve as a guide for the natural gas prospecting in this area.
SEM/EDAX STUDY ON MIXED LAYER CLAY MINERAL AND ITS RELATION WITH OIL GENERATION
Xi Ketang
1986, 8(3): 224-234. doi: 10.11781/sysydz198603224
Abstract(672) PDF-CN(323)
Abstract:
The illite content in the mixed layer can be obtained by systematic micro-area component analysis of M-I (montmorillonite-illite) mixed layer minerals in claystone using SEM/EDAX in stead of x-ray diffraction. According to the study on the mixed layer clay minerals in a certain well, the diagenetic stages can be divided primarily into two stages, early and middle; and the middle diagenetic stage can be subdivided into three sub-periods, early, middle and late. According to the illite content inre the mixed layer, the geothermal history can be inferred. Four temperature zones are delimitated. The major source bed is found to be at the middle period of middle diagenetic stage. The illite content in the mixed layer is 65-75%, and its maximum paleogcotemperature was 80-120℃.
THE BASEMENT STRUCTURE OF SICHUAN BASIN AND ITS RELATIONSHIP TO THE OVERLYING SEQUENCES
Kang Yichang
1986, 8(3): 235-242. doi: 10.11781/sysydz198603235
Abstract(618) PDF-CN(408)
Abstract:
In accordance with the parameters selected systematically from the drilling wells and the data from regional geological surveys on the border areas of Sichuan Basin, the integrated geological and geophysical interpretations for a new completed seismic profile in the basin are carried out. Thereafter, the location of the basement structure and the relationship to its overlying and underlying strata are described on the basis of the profile across the basin from Anxian to Wenshui. It concludes that the basement of the basin consists of a central ancient rigid massif and two foldbelts located at both sides of the massif with three different geological times. Based on Chinese tectonic framework, this paper completely describes the formation of the basement and the controlling factors of the basement on the deposition and tectonic development of its overlying sedimentary sequences.
GEOLOGICAL INTERPRETATION AND THE CHARAC-TERISTICS OF TECTONIC EVOLUTION ON REGIONAL SEISMIC PROFILE IN NORTH CHINA BASIN
Wei Zhengjin, Zhang Fushui, Huang Fengzhen
1986, 8(3): 243-252. doi: 10.11781/sysydz198603243
Abstract(590) PDF-CN(279)
Abstract:
North China Basin attributed to a type of cratonic basin from Sinian to Triassic time is superimposed by Meso-Cenozoic converted faultdown basins. The characteristics of seismic waves can be grouped into three regional datum waves, six reflective waves of local or erosion surfaces with four tectonic systems and six tectonic sub-systems. The basin might be divided into three types: the large scale of depression basin during Q-N; the graben and/or half-graben basin during E-J and the cratonic basin in T-Z period. In accordance to integrated geological inter-pretations and the data from seismic profile and gravity/electrical surveys, the tectonic evolution of the basin can be divided into three stages: the 1st stage, the platform developed steadily from Sinian to Triassic; the 2nd stage, two diktyogeneses took place under the joint actions of Tethys and Kula Plate from Late Indosinian to Early (or Middle) Yanshanian and Late Yanshanian to Early Xishanian with twice stress conversions and two different times of extension and depression basins; the 3rd stage, the collision between Indian Plate and Eurasian Plate, bringing about the third diktyogenesis and thd basin transformed from faultdown to depression.
METHOD OF “RECOVER LAYER BY LAYER” FOR CALCULATING THE PALEOTHICKNESS OF SEDIMENTARY LAYER
Yuan Bingcun, Qian Yizhong
1986, 8(3): 253-262. doi: 10.11781/sysydz198603253
Abstract(608) PDF-CN(195)
Abstract:
This paper describes the principle of the method by "recover layer by layer" for calculating the palaeothickness of sedimentary layer, and the applications and problems existed so far. The method of "recover layer by layer" is established on the concept of compaction of sedimentary layer, which applied the principle hypothesis that the solid height of sedimentary layer is not changed during the compaction. The thickness of sedimentary layer deposited in various geological periods could be recovered by calculating the solid height of sedimentary layer. The further calculations for compaction capacity, different compaction capacity, and changed value on the base boundary of sedimentary layer,the different compaction structures then could be analysed.
A QUANTITATIVE GC GAS ANALYSIS
Zhang Qu, Jiang Meixian
1986, 8(3): 263-270. doi: 10.11781/sysydz198603263
Abstract(587) PDF-CN(222)
Abstract:
A quantitaive GC gas analysis method is proposed in this paper.The authors have designed a device for the injection under negative pressure. It can solve problems that are difficult to get rid of in the conventional GC analysis. The device can provide a simple method for analysing a small amount of a gas sample and testing gas production potential in ampules.
A PRIMARY STUDY OF BIOMARKER COMPOUNDS (STEROIDS TERPENOIDS) FROM LATE CENOZOIC SEDIMENTS IN THE CHAN 3-BORING HOLE OF KUNMING BASIN
Song Zhenya, Bei Feng
1986, 8(3): 271-283. doi: 10.11781/sysydz198603271
Abstract(671) PDF-CN(255)
Abstract:
In this paper, the biomarker compounds (Steroids and terpenoids) in the extracts from Late Cenozoic sediments in the Chan 3-boring hole are studied by means of GC-MS. The Chan 3-boring hole is located at the eastern margin of Dianchi Lake in Kunming Basin. The Cenozoic sediments in the hole mainly consist of weakly consolidated sands, silts and clays with peat and brown coal seams, up to 516 m thick. The primary study of biomarker compounds shows that the composition, structure and distribution of biomarker compounds in the sediments are obviously different from those in source rocks and crude oils. Higher abundance of 17β(H), 21β (H) hopanes, and 5α(H), 14α (H), 17α (H), 20R-steranes and the presence of a lot of steranes and terpenes in these samples indicate that they are immature. There is no relationship between the characteristics of biomarker compounds in the sediments and the burial depth. This completely reflects the evolutionary level of organic matter in the sediments. But the relative amount of ββ-hopanes in the sediments tends to decrease gradually with increasing of depth, thus it can be considered as a more effective index for thermal evolution. The distributions of carbon number in steranes and terpanes are controlled by the types of the sediments. Relative amounts of C29 steranes and C27 hopanes in the carbonaceous mud and brown coal are larger than those in argillaceous sediments. It is interesting to note that the distributions of carbon number in ααα R-Sterancs series and αααR-Sterenes series are similar.
FLUID PRESSURE OF JURASSIC MUDSTONE AND ITS RELATION TO THE ACCUMULATION OF OIL AND GAS IN NORTHERN SICHUAN BASIN
Du Fengqin
1986, 8(3): 284-289. doi: 10.11781/sysydz198603284
Abstract(718) PDF-CN(342)
Abstract:
Based on the exploration practices in north and middle regions of Sichuan Prouiace, this paper tries to use the theory of the compaction of muds tones and the migration of fluids and probe into the relation between the fluid pressure in mudstones and the accumulation of oil and gas. The result of the isodepth calculation based on the curve of seismic time difference versus burial depth indicates that the mudstone source beds of Qianfoya Formation and the Daanzhai Member of Ziliujing Formation in northern Sichuan have abnormal high pressures. Primarily,it is believed that it is resulted from the inhomogeneous compaction of mudstones during the time from the beginning of Qianfoya Period to the end of the Late Shaximiao Period; and also from the integrated effects of various factors since then.
AN APPROACH TO THE GEOCHEMICAL CHARACTERISTICS OF IMMATURE CARBONATE SOURCE ROCKS
Xu Weimin
1986, 8(3): 290-294. doi: 10.11781/sysydz198603290
Abstract(564) PDF-CN(266)
Abstract:
After the crude oil of low-middle maturity, which generated and accumu-lated in situ, was found in the carbonate source bed of the Lower Qinglong Formation (T1X), Jurong Basin of Jiangsu,immature carbonate source rocks are also found in Upper Qinglong Formation(T1s). Such a discovery of immature carbonate source rocks in Lower Triassic, which relatively is rather old in geological time, is the first time in China, and it merits geologists attention. Analytical data of the composition of hydrocardon compounds, pyrolysis GC of rocks, GC of alkanes, IR of kerogens, and R° are used to reveal the geochemical characteristics of the immature carbonate source rocks and the geological origin.
PYROLYSIS GC OF THE PERMO-CARBONIFEROUS ROCKS AT WESTERN MARGIN OF ORDOS BASIN
Ma Hui
1986, 8(3): 295-298. doi: 10.11781/sysydz198603295
Abstract(540) PDF-CN(245)
Abstract:
In accordance with the data of pyrolysis GC, the integrated analyses and evaluations of the types, abundance, and evolutions of organic matter in the Permo-carboniferous source rocks of Ordos Basin are carried out in this paper. The scientifc basis for the oil/gas explorations in the western margin of Ordos Basin is provided.
1986, 8(3): 299-299. doi: 10.11781/sysydz198603299
Abstract(478) PDF-CN(184)
Abstract:

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