石油实验地质

APPROACH ON THE RELATION AMONG ANOXIC ENVIRONMENT, SOURCE ROCKS AND SUBAQUEOUS VOLCANIC ACTIVITY OF LOWER PALEOZOIC IN NORTH DABA AREA

Gao Changlin, Qin Deyu, Ji Rangshou, Yin Yong

1989, 11(2): 105-112. doi: 10.11781/sysydz198902105

Abstract(583) PDF-CN(282)

Abstract:
Lower Paleozoic of North Daba area consists of volcanic rocks,orga-nic-rich argillaceous rocks and siliceous rocks.Its kerogen type is sapr-opelic with high content of organics.The source rocks are rich in fluor-ine and sulfur,and bear a direct relation to subaqeous volcanic activity as indicated by fluorine and s34S of pyrite.Large quantity of H₂S,SO₂,SO₃,and CO₂ were extruded in the process of subaqeous volcanism,which caused chemical action with oxygen and water,and gravity differentiation of sea water,and provided good conditions for organic pres-ervation.As CH₄ entered atomsphere,combution took place with heat release,growth was promoted,which would provide material basis for oil and gas generation.

STUDY ON DEFORMATION AND METAMORPHISM OF JIXIAN—CAMBRIAN IN LUONAN, SHAANXI PROVINCE

Qu Guosheng

1989, 11(2): 113-124. doi: 10.11781/sysydz198902113

Abstract(550) PDF-CN(258)

Abstract:
By observation on cleavages of mylonites in fault zones in field and optical measurements of metamorpnic minerals in laboratory,it is recognized that three ductile shear napping faults,a ductile shear napping zone,a overturned synclines and a overturned anticline were developed in Jixian Cambrian in Luonan area.The deformation periods are late Caledonian,Variscian,and post Variscian.

MODELS OF SEISMIC FACIES FOR CONTINENTAL MONO—FAULTED BASINS IN EASTERN CHINA

Zhang Wanxuan, Zeng Hongliu, Zhang Houfu

1989, 11(2): 125-135. doi: 10.11781/sysydz198902125

Abstract(557) PDF-CN(416)

Abstract:
Mono-faulted lake basin was developed on one side of the continental faultdown in eastern China during early,middle and late evolution stages.Four sedimentary environments are recognized,i.e.areas of steep shelf,gentle shelf,lake center and the lake entry along long axis.There are 21 kinds of seismic facies models in 17 categories distributed sequentially.The characteristics of tne models are described,seperately.Because a central upl-ifting zone generally exists in double faulted basins,with depressions on both flanks comparable to mono-faulted basin.The models of seismic facies in eastern China could be summerized as mono-faulted models.

DISCUSSION ON FORMATIVE CONDITIONS FOR SALT IN PUKOU FORMATION OF CRETACEOUS SYSTEM IN HUAI AN DEPRESSION, NORTHERN JIANGSU

Gong Yujin, Kong Qingyu

1989, 11(2): 136-143. doi: 10.11781/sysydz198902136

Abstract(548) PDF-CN(281)

Abstract:
The generation,accumulation,preserving regulation of saline minerals in depression of Cretaceous system of the area are analysed,in respect of sedimentary sequence,palaeo-geography,palaeo-structure,palaeo-hydrology and preservation conditions.

EVOLUTION OF THE TYPE OF CARBONATE CEMENTS IN LOWER TERTIARY SANDSTONE OF GAO YOU DEPRESSION IN NORTHERN JIANGSU AND ITS GEOLOGICAL SIGNIFICANCE

Huang Bingshan

1989, 11(2): 144-151. doi: 10.11781/sysydz198902144

Abstract(601) PDF-CN(273)

Abstract:
The thin section study and electronic scanning microscopy were applied to carbonate cements in sandstones of oil layers in lower Tertiary of Gao You depression in northern Jiangsu.Based on the characteristics of evolution,five types of carbonate cements are determined.1.Micritic carbonate 2.recrystalliz-ed carbonate 3.dissolution carbonate relics 4.ferri-carbonate precipitates 5,Mosaic replaced carbonate.The relationship between the origins of various types of caronates and diagenetic stages and the affects on reservoirs were discussed.The author thought ferri-carbonate is likely to precipitate in the forms of Fe(OH)₃ and H₂S in the process of acidulation during field deve-loment,which would damage oil formation.

APPROACH ON SEDIMENTARY FACIES AND REEF WITH FAVOURABLE HYDROCARBON BEARING FACIES BELTS IN CHANG XING SERIES OF UPPER PERMIAN IN EASTERN SICHUAN AND WESTERN HUBEI

Liu Dacheng, Li Shushun

1989, 11(2): 152-159. doi: 10.11781/sysydz198902152

Abstract(580) PDF-CN(292)

Abstract:
Based on field practice and synthesis and analysis of a vast amount of data,the main pattern of sedimentary facies during Chang Xing period in eastern Sichuan and western Hubei was restored.It is recognized that the area during Chang Xing period was not a flat platform,and there are evi-dences of facies differentiation,including platform facies,platform trough facies,platform-basin facies,and biologic beach facies.There are shallow water facies,as well as deep water facies;and open sea facies,as well as restricted sea facies.The reef is characteristized by special sequence of for-mation and certain sedimentary environment,and hydrocarbon bearing facies belts were formed,which has been proved through petroleum exploration.

PRELIMINARY STUDY ON HYDROCARBON EXPULSION QUANTITY IN XIN GOUZUI FORMATION OF JIANGHAN BASIN

Wang Fengqin, Chen Heli, Luo Xiaorong

1989, 11(2): 160-166. doi: 10.11781/sysydz198902160

Abstract(682) PDF-CN(313)

Abstract:
In the light of the model of oil-gas primary migration proposed by Di-ckie and Zhen Bing Qinru,on the basis of the study on claystone compa-ction in Jianghan Basin,the authors have suggested a formula for the cal-culation of hydrocarbon expulsion quantity.Q=w.q.d,using relative permeability of oil-gas,and the relation of oil-gas saturation to Darcy law.In selecting parameters,compaction curve of claystone in the region was ado-pted directly to calculate the quantity of interstitial fluid loss,meanwhile,with rating curve for oil-gas saturation versus relative permeability of oil-gas in the studied area,the ratios of relative permeabilities of oil-gas for the claystone under different saturations were calculated.

EVOLUTION OF METHANE FROM DEEP SOURCE AND ORIGIN OF CARBON DIOXIDE

LIU Bin

1989, 11(2): 167-176. doi: 10.11781/sysydz198902167

Abstract(563) PDF-CN(425)

Abstract:
Considering the equilibrium system of CH₄-H₂O-CO₂ and the reaction of methane with CaSO₄(gypsum)in water for example,with the viewpoint of statistical thermodynamics and chemical thermodynamic equilibrium,the conditions and direction of the reaction are studied,as a result,the rela-tion of equilibrium constant and temperature-pressure are inferred.Besides,the neccessary conditions for the preservation and destruction of methane gas under different burial depths and for the generation of carbon dioxide are discussed.It is proposed that the acidity of sedimentary environment,or the pH value,is an important factor which acts in conjunction with temperature in the hydrolysis of carbonate rocks.

FRACTIONATION OF CARBON ISOTOPES OF ORGANIC MATTER AND ITS GEOLOGICAL SIGNIFICENCE

Zhang Wenzheng

1989, 11(2): 177-184. doi: 10.11781/sysydz198902177

Abstract(618) PDF-CN(388)

Abstract:
With analyses of stable carbon isotopes on various products obtained from thermal simulated experiments,the dynamical fractionating mechanisms of stable carbon isotopes of thermal evolutionary products of such as oil and its group components,gaseous hydrocarbons,and residues were studied.In add-ition a new method was proposed which could be used for distinguishing con-densates of low maturity(products of coal measures)from condensates of high maturity(products from cracking of crude oil),and for identifying the types of origin of natural gas.

AROMATIC—STERANES AND THEIR IDENTIFICATION BY GC—MS

Zhou Rongjie, Zhang Xiangji

1989, 11(2): 185-194. doi: 10.11781/sysydz198902185

Abstract(610) PDF-CN(312)

Abstract:
Based on the summerization of information home and abroad,geochem-ical characteristics i.e.source,evolution,and texture of aromatic steranes are described.15 new compounds of aromatic sterane were identified by GC-MS.In addition,the authors explained in detail the MS reactional mechanism of the compounds of aromatic steranes,which would provide evidences for the study and identification of the texture of aromatic steranes.

ELECTRONIC PROBE MICROANALYSIS OF OSTRACODA AND STUDY ON THEIR ORGANICS

Pan Xiaoming, Jiang Kaixia

1989, 11(2): 195-202. doi: 10.11781/sysydz198902195

Abstract(571) PDF-CN(306)

Abstract:
Using EPMA.etc,the shell compositions of Cretaceous Ostracoda of 23 samples from 10 wells in Songliao basin were analysed.The data obtained reveal a distinct relation between values of magnesium/ manganese ratio and sedimentary facies belts.With the application of X-ray spectroscopy,scanning electron microscopy and pyrolysis chromatography,it has been found that there is a little organics including amino acid in the fillings of the cores of Ostracoda,which could be evolved to hydrocarbons.This result may provide new way for further study of microfossils and new data for the study of oil generation.

1989, 11(2): 203-204. doi: 10.11781/sysydz198902203

Abstract(487) PDF-CN(264)

Abstract:

1989 Vol. 11, No. 2

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