柴西地区基岩油藏形成的石油地质条件分析

吴颜雄, 马达德, 刘君林, 薛建勤, 张娜, 刘海珍, 黄建红, 鲁珊珊, 张勤学

doi:10.11764/j.issn.1672-1926.2014.11.1689

天然气地球科学 >

2014 , Vol. 25 >Issue 11: 1689 - 1696

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.11.1689

天然气地质学

柴西地区基岩油藏形成的石油地质条件分析

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1.中国石油青海油田勘探开发研究院，甘肃敦煌 736202；
2.中国石油青海油田井下作业公司，甘肃敦煌 736202；
3.中国石油青海油田采油二厂，甘肃敦煌 736202；
4.中国石油青海油田采油一厂，甘肃敦煌 736202

吴颜雄(1982-)，男，甘肃敦煌人，高级工程师，主要从事石油地质研究.E-mail:wyxqhyjy@petrochina.com.cn.

收稿日期: 2014-01-14

修回日期: 2014-03-24

网络出版日期: 2019-09-20

基金资助

国家科技重大专项“大型油气田及煤层气开发”之“柴达木冲断带油气富集规律、勘探技术与区带和目标优选”项目(编号:2011ZX05003-006)资助.

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Geological Conditions of Basement Oil Pools in Western Qaidam Basin

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1.Qinhai Oilfield Research Institute of Exploration and Development,DunHuang 736200,China; 2.Borehole Operation Company of Qinhai Qilfield Company, DunHuang 736200,China; 3.Two Oil Producing of Qinhai Oilfield Company, DunHuang 736200,China; 4.One Oil Producing of Qinhai Oilfield Company, DunHuang 736200, China

Received date: 2014-01-14

Revised date: 2014-03-24

Online published: 2019-09-20

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摘要

柴达木盆地基岩风化壳油藏普遍发育，在昆北等区已形成油田。然而，目前对基岩油藏的成藏背景认识不清，制约了勘探步伐。利用钻井、测井、试油和分析化验等资料对基岩油藏基本特征及成藏条件进行分析，认为该区油藏是受岩性及构造多重因素控制的复合油藏，成藏需紧邻富烃凹陷、具有良好的储盖组合和油源断裂3个基本条件。通过油藏解剖发现，基岩油藏属于源外次生成藏，根据油气侧向运移方式、远近不同建立2种成藏模式:①油源断裂+裂缝输导的近源成藏模式；②油源断裂+不整合面侧向运移+次级断裂辅助运移的远源成藏模式。研究以期对柴达木盆地基岩风化壳油气藏的勘探提供地质理论依据。

关键词： 柴达木盆地; 基岩油藏; 风化壳; 成藏地质条件; 成藏模式

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吴颜雄, 马达德, 刘君林, 薛建勤, 张娜, 刘海珍, 黄建红, 鲁珊珊, 张勤学 . 柴西地区基岩油藏形成的石油地质条件分析[J]. 天然气地球科学, 2014 , 25(11) : 1689 -1696 . DOI: 10.11764/j.issn.1672-1926.2014.11.1689

Abstract

Oil reservoirs in top of weathering crust are widespread in Qaidam Basin,which have formed oilfield in areas such as Kunbei.However,the formation background of basement oil pools is unclear,which restricts the pace of exploration.This paper analyzed the basic characteristics and formation conditions of basement oil pools by using well drilling,earthquake,oil production testing and chemical analysis data.The bedrock reservoirs are mostly the composite reservoirs which are controlled by lithology and tectonic in western Qaidam Basin.There are three basic conditions which control the formation of oil pool,i.e.,close to the hydrocarbon-enriched depression,good reservoir-sealing assemblage,and oil-migrating fault which connects the source and reservoir providing mainly longitudinal channel system to form reservoirs.According to oil reservoir analysis,the oil reservoir in bedrock belongs to external source secondary reservoir.Therefore,two reservoir formation models are established according to the oil migration mode and distance,near-source box-type gas accumulation model which includes oil-migratingfault and fracture migration and far-source box-type gas accumulation model which includes oil-migrating fault,lateral migration on the unconformity surface and secondary fault migration.The aim of this research is to provide geological theory basis for exploration of the oil reservoirs of bedrock in western Qaidam Basin.

Key words： Qaidam Basin; Basement limestone oil pool; Weathering crust; Reservoir forming geologic condition; Reservoir-forming pattern

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