膏盐岩盖层封闭性动态演化特征与油气成藏——以库车前陆盆地冲断带为例

doi:10.7623/syxb201405004

石油学报 ›› 2014, Vol. 35 ›› Issue (5): 847-856.DOI: 10.7623/syxb201405004

膏盐岩盖层封闭性动态演化特征与油气成藏——以库车前陆盆地冲断带为例

卓勤功¹, 赵孟军¹, 李勇², 王媛²

1. 中国石油勘探开发研究院北京 100083;
2. 中国石油塔里木油田公司勘探开发研究院新疆库尔勒 841000

收稿日期:2014-03-13 修回日期:2014-06-20 出版日期:2014-09-25 发布日期:2014-08-05
通讯作者: 卓勤功，男，1969年12月生，1992年获长春地质学院学士学位，2007年获中国石油大学（华东）博士学位，现为中国石油勘探开发研究院高级工程师，主要从事油气成藏研究工作。Email：zhuoqg@petrochina.com.cn
作者简介:卓勤功，男，1969年12月生，1992年获长春地质学院学士学位，2007年获中国石油大学（华东）博士学位，现为中国石油勘探开发研究院高级工程师，主要从事油气成藏研究工作。Email：zhuoqg@petrochina.com.cn
基金资助:
国家重大科技专项（2011ZX05003）和中国石油天然气股份有限公司科技项目（2011B-04、2014B-04）资助。

Dynamic sealing evolution and hydrocarbon accumulation of evaporite cap rocks：an example from Kuqa foreland basin thrust belt

Zhuo Qingong¹, Zhao Mengjun¹, Li Yong², Wang Yuan²

1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. Research Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Xinjiang Korla 841000, China

Received:2014-03-13 Revised:2014-06-20 Online:2014-09-25 Published:2014-08-05

摘要/Abstract

摘要：

受岩石力学特征及区域构造应力的影响，膏盐岩层也会产生断裂和裂缝，大规模油气可穿盐盖层运移。膏盐岩三轴加温加压应力应变实验表明，膏盐岩具有“浅埋低温脆变、深埋高温塑变、强挤压破坏形变”的岩石力学特征，膏盐岩脆-塑转换的关键地层温度约为100℃。结合库车前陆冲断带成藏期古地温参数，确定3 000 m是库车坳陷前陆冲断带膏盐岩脆-塑转换的关键埋深，塑性膏盐岩盖层挤压流动不易破裂，已有断层因岩盐的流动而弥合、焊接，野外盐构造特征及盐岩流体包裹体显微特征提供了有力的佐证。库车前陆冲断带膏盐岩盖层封闭性地质历史时期是演化的、且空间上具有一定分布规律，从而控制着冲断带油气成藏过程及差异。

关键词: 膏盐岩, 脆-塑性, 封闭性演化, 油气运聚, 库车坳陷, 前陆冲断带

Abstract:

Due to the effects of mechanical factors and regional tectonic stress, evaporites can form faults and fractures, leading to large-scale oil and gas migration through the cap rocks. The results of triaxial stress-strain experiment with heating and pressurizing show that evaporites feature embrittlement with shallow depth and low temperature, ductile deformation with deep depth and high temperature, and failure deformation with strong extrusion. The crucial formation temperature for brittle-ductile transition of evaporites is approximately 100℃. Taking into consideration the paleotemperature parameters during hydrocarbon accumulation, it is determined the crucial burial depth for brittle-ductile transition of evaporites reaches 3 000 m in Kuqa foreland thrust belt. The ductile evaporite cap rocks are hardly broken by flow during compression, and the existing faults are closed or welded due to salt rock flow. The above findings can be supported by strong evidence including field characteristics of salt structures and microscopic characteristics of fluid inclusions contained in evaporites. Therefore, the sealing of evaporite cap rocks is evolutive during the geological history in Kuqa foreland thrust belt and features specific spatial pattern, thereby controlling the process of hydrocarbon accumulation and associated difference in the thrust belt.

Key words: evaporite, brittle-plasticity, sealing evolution, hydrocarbon migration, Kuqa depression, foreland thrust belt

中图分类号:

TE112.31

卓勤功, 赵孟军, 李勇, 王媛. 膏盐岩盖层封闭性动态演化特征与油气成藏——以库车前陆盆地冲断带为例[J]. 石油学报, 2014, 35(5): 847-856.

Zhuo Qingong, Zhao Mengjun, Li Yong, Wang Yuan. Dynamic sealing evolution and hydrocarbon accumulation of evaporite cap rocks：an example from Kuqa foreland basin thrust belt[J]. ACTA PETROLEI SINICA, 2014, 35(5): 847-856.

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膏盐岩盖层封闭性动态演化特征与油气成藏——以库车前陆盆地冲断带为例

Dynamic sealing evolution and hydrocarbon accumulation of evaporite cap rocks：an example from Kuqa foreland basin thrust belt

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