石油实验地质

PRELIMINARY COMMENT ON THE VARIATION OF CARBON ISOTOPIC COMPOSITION OF METHANE IN COAL MEASURE GAS AND SEAM GAS, AND ITS CONTROLLING FACTOR

Qi Houfa

1985, 7(2): 81-86. doi: 10.11781/sysydz198502081

Abstract(506) PDF-CN(350)

Abstract:
The genetic types of natural gases are discussed according to the stable carbon isotopic composition of natural gases.It is found that the coal measure gas and the seam gas with the same maturity show great differences both in chemical and carbon isotopic composition.After various cor-relative analyses were made,the author proposes that the controlling factors of the differences are mainly,(1) the influence of biogenic methane in coalbed;and (2) the exchange of carbon isotopes between CH₄ and CO₂.

EARLY TERTIARY SEDIMENTARY ENVIRONMENT AND THE OIL AND GAS OF DONG MING DEPRESSION

Chen Xiadong, Gao You

1985, 7(2): 87-97. doi: 10.11781/sysydz198502087

Abstract(484) PDF-CN(338)

Abstract:
Dong Ming Depression is an early Tertiary block-faulting basin of graben type.The basin in-fillings are predominatingly clastic with subordinate lacustrine chemical rocks.Fluvial sediment developed only in Dong Ying Formation,The lacustrine sediments of Dong Ming Depression are devided into three sedimentary systems:lacustrine allochthonous clastic;and reworked sediments.It is thought that the alluvial fan subfacies,overbank and lake sub-facies,and gravitational current sediment sub-fades with different sedimentary backgrounds are characteristics of the sedimentary environment for block-faulting lake.The alluvial fan sand body and the gravitational current sand body are the major reservior for oil and gas;and the combined structural and lithological trap is the main type of oil and gas traps in Dong Ming Depression.

EVALUATION OF PETROLEUM POTENTIAL OF UPPER TRIASSIC SPONGE PATCH REEFS IN NORTHWESTERN SICHUAN

Wu Xichun, Bei Feng, Zhang Liangjian

1985, 7(2): 98-106. doi: 10.11781/sysydz198502098

Abstract(486) PDF-CN(387)

Abstract:
A sponge patch reef complex is found within the strata of Carnian Hanwang Formation.The reefs existed in the Tethysian ocean.They are not of organic skeletal reefs,but of sponge-baffled bioherms.Based on the study of geological and geochemical features of the reef complex,and physical properties of potential reservoir rock,it is proposed that the buried part of the reef group is of hydrocarbon potential,and this is a clue to search for oil and gas in northwestern Sichuan Basin.

THE STUDY OF ANNULAR DRAINAGE OF THE ANCIENT LAKE AND THE PROSPECTING FOR SUBTLE OIL POOLS IN CRETACEOUS SONGLIAO LACUSTRINE BASIN

An Zuoxiang

1985, 7(2): 107-113. doi: 10.11781/sysydz198502107

Abstract(508) PDF-CN(339)

Abstract:
The extent of Songliao lacustrine basin in Cretaceous time reached its maximum during the deposition of Qingshankou Formation,covering approx-imately 150,000km².the uplifting of lake bottom at Daqing,Yangda-chengzi,Fuyu,and Suileng separated the basin into two parts:the east depression and the west depression.The rivers on the northern margin and the western margin of the lacustrine basin all entered the ancient lake,forming an annular drainage.the drainage pattern resulted in a coil-like distribution of the sand bars in the shallow and deeper parts of the lake,which after diagenetic compaction,formed anticlinal features of low elevation.As source rocks generally occurred in the central parts of the drainage system,these bars became favourable sites for the formation of subtle oil pools.

INDOSINIAN YENSHANIAN TECTONIC EVOLUTION OF XIKUANGSHAN, HUNAN AND ITS SIGNIFI-CANCE FOR OIL AND GAS PROSPECTING

Ji Rangshou

1985, 7(2): 114-123. doi: 10.11781/sysydz198502114

Abstract(454) PDF-CN(247)

Abstract:
This paper deals with the folds and faults of different directions,the minor-structures,especially incipient en echelon tension fissures filling with veins that are widely developed.It is shown that four horizontal compressive tectonic stress fields of different directions successively exerted on this district during the period from Indosinian to Yenshanian.This discovery is important and it provides clues and evidents for studying the tectonic evolution during this period in Southern China.According to the characteristics of structural deformation that were caused by different tectonic stress fields,it is inferred that there are possible favorable structural traps in the oil and gas-bearing rocks ranging from Upper Palaeozoic to Lower Triassic in Mid-Hunan area.We hope this result will throw some light on prospecting in this district.

THE ACTIVITIES OF MANTLE HEAT SOURCE AND LANDMASS DRIFT IN THE SOUTH CHINA AREA

Zhang Yongxia

1985, 7(2): 124-131. doi: 10.11781/sysydz198502124

Abstract(1140) PDF-CN(307)

Abstract:
Ring structures of various grades spread widely in the South China area.It is an important intra-plate structure type resulted from the action of mantle heat source on lithosphere since Mesozoic.The second grade ring appeared as four NW-trend ring-chains.The formation time was successively later and later,as moving toward SE.The author tries to explain this phenomena by landmass drift on a fixed heat source settled in mantle.The idea is set up according to the relative movement of mantle heat source (thermal plume) towards SE as the lithosphere (landmass) drifts oppositely above it.It is inferred that South China Landmass drifted a distance of about 600km towards NW during middle-late stage of Mesozoic (190-90 m.y.B.C.) with a speed of 6 km per m.y.Based on the comprehensive analysis of paleomagnetism,paleontology,paleoclimate and track of the mantle heat source,it is indicated that South China Landmass have drifted toward NW in period of Ceno-Mesozic.At Late Permian period (240 m.y.B.C.),it was located in the vicinity Of equator,in the present ocean area between New Guinea and Garoling Islands of SW Pacific.In Late Mesozoic (about 110 m.y.B.C),South China Landmass drifted northwestwards to 14?-24皀orth latitude of the present Philippine Sea Basin.During 190-25 m.y.B.C.,the diift speeded up gradually,varying from 0.6 to 3.8 cm/yr.

FAULTING AND ITS RELATION TO PETROLEUM ACCUMULATION IN PETROLIFEROUS AREA OF NORTHWEST CHINA

Yan Yugui

1985, 7(2): 132-135. doi: 10.11781/sysydz198502132

Abstract(460) PDF-CN(318)

Abstract:
While searching for petroleum in petroliferous basin formed by compressional stress,much attention must be paid to the faults developed on the margin of a basin;and to the drag folds and faulting blocks which were formed due to faulting.In these areas,petroleum is likely to accumulate,and to form a petroleum field.The formation,evolution of a petroliferous basin and petroleum accumulations are closely related to faulting.For example,the petroliferous structural zones of the petroleum distributing area in Northwest China are mostly controlled by faulting.

SATELLITE IMAGE INTERPRETATION OF ZI JING GUAN DEEP FAULT IN NORTH CHINA

Piao Yunxi

1985, 7(2): 136-140. doi: 10.11781/sysydz198502136

Abstract(516) PDF-CN(285)

Abstract:
A comprehensive geological interpretation of Zi Jing Guan deep fault at the west edge of North China Basin is made by using satellite image information,with region and geophysical data as background.Zi Jing Guan deep fault is located at the west edge of North China Basin in NNE-SSW.It stretches southwestward from east of Chicheng along Taihanshan Mountain passing Xiongershan and Qinling-Daibieshan folded belt,extended to the south flank of Huangling anticline.The total length within North China area is 900 km.Based on the geological features of the fault,it can be divided into three sections:north,middle and south.It was in embryo at the end of Middle Triassic time,formed in shape at the end of Late Triassic time,and the main body was completed at Late Jurassic.Magma intrusion of Cretaceous time brought the fault developement to a climix.

AGE ASSIGNMENT OF THE PINGDINGSHAN MEMBER IN HENAN AND ANHUI PROVINCES

Ouyang Shu, Wang Rennong

1985, 7(2): 141-147. doi: 10.11781/sysydz198502141

Abstract(781) PDF-CN(354)

Abstract:
Pingdingshan Member,which was named Pingdingshan Sandstones in 1955 is a litho-stratigraphical unit that is widely distributed over the area of Henan,Anhui,northwestern Jiangsu and southern Shandong provinces.lt consists mainly of light gray,greyish white,purplish green and grey sandstones intercalated with,siltstones and sandy marls,with a thickness up to 60-120m.The Pingdingshan Member rests conformably upon the Shiqianfeng Formation (Upper Shihetze Formation).The geological age still is a problem unsolved.(P₂¹—P₂²—T₁?) According to the preliminary identification,the Pingdingshan Member should be Late Permian in age,and stratigraphically it can be roughly correlated with the lower part of the Shiqianfeng Formation in northern China.

THE BEHAVIOR OF LOWER PALEOZOIC CAR-BONATE RESERVOIR IN LAIWU AREA SOUTHWESTERN SHANDONG

Zhou Chaoran, Shao Junlin

1985, 7(2): 148-154. doi: 10.11781/sysydz198502148

Abstract(486) PDF-CN(220)

Abstract:
The behavior of Paleozoic carbonate reservoir in Laiwu area is roughly known by pore geometry analysis,thin section cast observation and conventional petro-physical properties determination.There are more than 20 layers with thickness of 150m are favourable reservoir in this section.The types of the reservoir are:for Middle Cambrian,mainly dissolution vug type;for Ordovician,mainly fracture-dissolution vug type.There are 12 types of pore space:dissolution pore;intercrystalline pore;intercrystalline dissolution pore;intracrystalline dissolution pore;intergranular dissolution pore;intragranular dissolution pore;dolomite casting mould pore;structural fracture;interformational fracture;diagenetic fraccture;dissolution trace,stylolite etc.Secondary pore zones with developed dissolution pore,cavern,and crack were often formed near paleoerosional surfaces.There sre 6 secondary pore zones in this section.

HPLC ANALYSIS OF PERYLENE IN AROMATIC HYDROCARBON FRACTION

Tong Dingxun, Liu Jingwen, Zhang Weihang

1985, 7(2): 155-160. doi: 10.11781/sysydz198502155

Abstract(564) PDF-CN(267)

Abstract:
HPLC with two cells of UV-visible spectrophotometric detector is used in this measuring method.While the aromatic hydrocarbon fraction is being eluted from column,qualitative and quantitative analyses of perylene are accomplished.The result shows that it is a rapid and reliable method.The limit of detection of perylene is 0.02 ng (0.005 AUFS).

ASSEMBLY OF A COMPACT MICROPHOTOMETER

Liu Chongbao

1985, 7(2): 161-166. doi: 10.11781/sysydz198502161

Abstract(480) PDF-CN(271)

Abstract:
The technically key problems of a compact microphotometer designed and assembled by ourselves are discussed in this paper.After repeated adjustment and samples testing,the major technical parameters and the measuring accuracy are comparable with that of Leitz MPV-3.

1985 Vol. 7, No. 2

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