Hydrocarbon generation and accumulation characteristics of three type source rocks of Liu Ⅱ segment in Beibuwan Basin

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  • 1.CNOOC Research Institute,Beijing 100028,China;
    2.PetroChina Changqing Oilfield Company No.3 Oil Recovery Factory,Yinchuan 750005,China

Received date: 2018-01-23

  Revised date: 2018-06-04

  Online published: 2019-08-28

Abstract

The whole Liu Ⅱ segment lacustrine source rock is regarded as the major source rock of Beibuwan Basin according to the previous study.New study has been done on Liu Ⅱ segment source rocks in Beibuwan Basin based on the application of geochemical data of plenty of oil and source rocks combined with sedimentary and geological information.It shows that Liu Ⅱ segment lacustrine source rocks of Paleogene deposition can be classified into three types of high quality (oil shale),good and general source rocks due to the heterogeneity of lacustrine source rocks.According to hydrocarbon generation and accumulation study,there is significant different contribution to accumulation among these three types of source rocks.The high quality source rock (with high abundance of organic matter,type Ⅰ kerogen,hydrocarbon potential up to 500mg/gTOC) contributes about more than 80% of the reserve of major oilfields of Weixinan Sag and Wushi Sag;Good source rock (medium abundance of organic matter,type Ⅱ1 kerogen,hydrocarbon potential of 300mg/gTOC) comes secondary with the contribution merely about 20%;and fair source rock (lower abundance of organic matter,type Ⅱ2 kerogen,hydrocarbon potential of 200mg/gTOC) has less contribution to the reserve oil.Hence,the high quality source rock of lacustrine,located at the lower part of Liu Ⅱ segment with thickness of 50m to 100m,is the real major source rock of Beibuwan Basin.Oil generated from high quality source accumulated at the reservoir of Liu Ⅱ and Ⅲ segments,Changliu Formation and Jiaowei Formation,while the oil yielded by good source rocks was trapped at Liu Ⅰ segment and Weizhou Formation.Due to the differences of TOC abundance,kerogen and hydrocarbon potential of these three types of source rocks,for the exploration in Beibuwan Basin,clarification of high quality source rock is helpful to enhance the success rate of exploration.

Cite this article

Fu Ning, Liu Jian-sheng . Hydrocarbon generation and accumulation characteristics of three type source rocks of Liu Ⅱ segment in Beibuwan Basin[J]. Natural Gas Geoscience, 2018 , 29(7) : 932 -941 . DOI: 10.11764/j.issn.1672-1926.2018.06.002

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