Organic geochemistry identification of high-quality source rocks in the 2nd member of Liushagang Fm and its controls on petroleum occurrence in the Weixi'nan Sag, Beibuwan Basin

Gang Gao; Xinde Xu; Shiju Liu; Jun Gan; Chenhui Hu; Jianyu Zhao

doi:10.11743/ogg20200210

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Organic geochemistry identification of high-quality source rocks in the 2nd member of Liushagang Fm and its controls on petroleum occurrence in the Weixi'nan Sag, Beibuwan Basin
Vol. 41, Issue 2, Pages: 339-347(2020)
Received：04 June 2018，

Published：28 April 2020
DOI： 10.11743/ogg20200210
稿件说明：

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DOI：

Gang Gao, Xinde Xu, Shiju Liu, et al. Organic geochemistry identification of high-quality source rocks in the 2nd member of Liushagang Fm and its controls on petroleum occurrence in the Weixi'nan Sag, Beibuwan Basin[J]. Oil & Gas Geology, 2020, 41(2): 339-347. DOI： 10.11743/ogg20200210.

摘要

针对北部湾盆地涠西南凹陷流沙港组湖相优质烃源岩发育特征及其控油作用不清的实际，基于烃源岩生、排烃基本原理，利用有机地化方法建立判别优质烃源岩的方法，并确定了其分布和对油气分布的控制作用。流沙港组泥岩是涠西南凹陷的主要烃源岩，从下到上分为流三段、流二段和流一段，流二段为主力烃源岩。依据生、排烃基本原理，利用烃源岩

TOC

含量与热解

、氯仿沥青“A”含量的关系确定的流沙港组湖相优质烃源岩的

TOC

含量界限值为2%左右。流二段底部黑色页岩

TOC

含量均大于2%，母质类型好，生烃潜力高，均属于优质烃源岩；部分暗色泥岩属于优质烃源岩。与流二段底部黑色页岩有亲缘关系的原油既可在黑色页岩层段之下近源运移、聚集，也可沿流二段之下的流三段砂体长距离侧向运移而在构造高部位聚集；与暗色泥岩有亲缘关系的原油主要在凹陷内部优质烃源岩层之上的流一段—涠洲组聚集，断裂为近距离垂向运移通道，源控特征显著。

Abstract

In the Weixi'nan Sag of the Beibuwan Basin

the high-quality lacustrine source rock in the Liushagang Fm has been poorly understood in terms of its characteristics and its controls on hydrocarbon distribution.To this end

we establish an organic geochemical method to identify quality source rocks

and reveal the source rock distribution pattern and its controls on hydrocarbon distribution

based on the fundamental mechanisms of hydrocarbon generation and expulsion for source rocks.Among others

the major source rocks for the Weixi'nan Sag are the Liushagang Fm shale

which can be divided into three intervals

namely the Liu 3

Liu 2 and Liu 1 members downwardly

with the Liu 2 member as the major zone.Based on the principle of hydrocarbon generation and expulsion for source rocks as well as relations between the

TOC

content

and the pyrolysis

and chloroform bitumen "A" content of mature source rocks

we identify the lower limit value of

TOC

content of the high-quality lacustrine source rocks in the Liushagang Fm is about 2%.The black shale at the bottom of the Liu 2 member (E

) with a

TOC

content higher than 2%

contains oil-prone organic matters with high hydrocarbon-generating potential

and is high-quality source rocks.Part of the dark mudstone is also high-quality source rocks.The crude oil

expelled from the black shale at the bottom of Liu 2 member could migrate in short distance and accumulate under the black shale interval

or could migrate laterally in long distance along the sand bodies in the Liu 3 member and accumulate at higher structures.However

the crude oil expelled from the dark mudstone mainly accumulates in the Liu 1 member and Weizhou Fm

which are vertically above the quality source rocks inside the sag

with faults as the vertical pathway for migration and thus the accumulation is directly characterized by source rock distribution.

关键词

Keywords

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