天然气地质学

塔里木盆地调整型油气藏流体特征与聚集规律——以巴什托油气藏为例

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  • 1.中国地质大学(北京),北京 100083;2.中国石油勘探开发研究院,北京 100083;
    3.中国石油塔里木油田分公司,新疆 库尔勒 841000
姚远(1986-),女,陕西西安人,工程师,博士在读,主要从事油气工业标准化及油气勘探开发研究. E-mail:yao-yuan@petrochina.com.cn.

收稿日期: 2015-12-06

  修回日期: 2016-01-06

  网络出版日期: 2019-09-19

基金资助

中国石油天然气股份有限公司重大科技攻关专项“塔里木油田勘探开发关键技术研究及应用”(编号:22121G20112001)资助.

Fluid characteristics and accumulating patterns of adjusting reservoirs in the Tarim Basin:Taking Bashituo hydrocarbon reservoir as an example

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  • 1.China University of Geosciences(Beijing),Beijing 100083,China;
    2.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    3.Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2015-12-06

  Revised date: 2016-01-06

  Online published: 2019-09-19

摘要

次生调整型油气藏是塔里木叠合盆地重要的油气聚集类型,多经历过复杂的充注与改造过程,而不同地质背景下的油气藏具有差异的演化历史。巴什托油气藏与塔北和塔中地区调整型油气藏具有不同的特征,恢复其成藏过程有利于揭示塔西南构造枢纽带次生调整型油气藏的聚集规律,寻找有利勘探区域。通过流体物理性质和地球化学性质分析,探讨巴什托油气藏中油气的次生变化和调整过程,结合流体包裹体测温和精细构造解释,恢复油气藏的成藏演化历史。①原油普遍高含C29三芳甲藻甾烷,高含伽马蜡烷,甾烷含量C29>C27>C28,表明主要来源于寒武系烃源岩;②原油中含有25-降藿烷,指示早期原油经历过的降解,饱芳比、Ts/(Ts+Tm)和C23TT/C30Hop参数指示油气自西向东运移;③晚海西期和晚喜马拉雅期发生过2期油气充注,早期油气在中生代抬升剥蚀过程中遭受降解破坏,上新世晚期以来,圈闭发生构造翘倾,油气在圈闭内自西向东调整迁移,形成现今多层含油气的格局。根据巴什托油气藏调整过程分析,推测麦盖提斜坡西北部低幅度构造和色力布亚断裂高部位构造圈闭可能是次生调整型油气和晚期气侵的有利区域。

本文引用格式

姚远, 肖中尧, 王宇, 张宝收, 高圣平 . 塔里木盆地调整型油气藏流体特征与聚集规律——以巴什托油气藏为例[J]. 天然气地球科学, 2016 , 27(6) : 1003 -1013 . DOI: 10.11764/j.issn.1672-1926.2016.06.1003

Abstract

Secondary adjusting reservoir is one of the most important hydrocarbon reservoir types in the Tarim Basin,which experienced multistage charging and alteration.The adjustment history of different adjusting reservoirs varies as they evolved under different geological background.Bashituo adjusting reservoir bears unique characteristics in comparison with Tabei and Tazhong adjusting reservoir.Thus,hydrocarbon accumulating pattern of adjusting reservoir in tectonic tilting zone which located in the southwest Tarim Basin could be uncovered by restoring the evolutionary process of Bashituo reservoir,which may result in finding new exploration zone.Secondary alteration and adjustment processes of hydrocarbon in Bashituo reservoir were discussed via analyzing the physical and geochemical properties of fluid from different wells.Fluid inclusion analysis and detailed tectonic explanation were implemented to restore the hydrocarbon accumulating history.(1)Most crude oils have high content of triaromatic C29 methylsteroid and Gammacerane.The content of C29 sterane is higher than that of C27 and C28 sterane,indicating that crude oils originated from Cambrian source rocks.(2)25-norhopane was detected in crude oils,indicating that  oil accumulating in the earlier stage was degraded.Saturates/aromatic components,Ts/Ts+Tm and C23 TT/C30 Hop ratios indicate that oils migrated from west to east during the late stage.(3)Hydrocarbon charged into Bashituo reservoir during Late hercynian and Late Himalayan tectonic movement stages.Crude oils were biodegraded during Mesozoic when this area was uplifted.The trap migrated from west to east direction as the result of tectonic tilting of the southwest Tarim Basin since Pliocene.It is suggested that the low amplitude structures that located in the northwest of Bashituo reservoir and the structural traps which located nearby the Selibuya fault are favorable zones for accumulating hydrocarbons by secondary adjustment.

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