川西坳陷须家河组二段致密砂岩储层成岩作用与孔隙演化——以大邑地区为例

doi:10.11743/ogg20120215

石油与天然气地质 ›› 2012, Vol. 33 ›› Issue (2): 287-295,301.doi: 10.11743/ogg20120215

川西坳陷须家河组二段致密砂岩储层成岩作用与孔隙演化——以大邑地区为例

罗文军¹, 彭军¹, 杜敬安², 杜垒³, 韩海臣⁴, 刘焕¹, 李剑波⁵, 唐勇⁶

1. 西南石油大学资源与环境学院, 四川成都 610500;
2. 中国石油大庆油田公司海拉尔石油勘探开发指挥部, 内蒙古呼伦贝尔 021008;
3. 中国石油新疆油田公司重油开发公司, 新疆克拉玛依 834000;
4. 青海省第八地质矿产勘查院, 青海西宁 810001;
5. 中国石化西南油气分公司勘探开发研究院, 四川成都 610000;
6. 中国石化西南油气分公司川西采气场, 四川德阳618000

收稿日期:2012-01-10 修回日期:2012-02-16 出版日期:2012-04-28 发布日期:2012-05-24
基金资助:
中国石油科技创新基金项目(2010D-5006-0103)。

Diagenesis and porosity evolution of tight sand reservoirs in the 2^nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region

Luo Wenjun¹, Peng Jun¹, Du Jing’an², Du Lei³, Han Haichen⁴, Liu Huan¹, Li Jianbo⁵, Tang Yong⁶

1. School of Resources and Environment, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Hailar Petroleum Exploration and Development Headquarters, PetroChina Daqing Oilfield Company, Hulunbeier, Inner Mongolia 021008, China;
3. Heavy Oil Development Company, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
4. No.8 Institute of Geological and Mineral Exploration of Qinghai Province, Xining, Qinghai 810001, China;
5. Research Institute of Exploration and Development, SINOPEC Southwest Oilfield Company, Chengdu, Sichuan 610500, China;
6. Chuanxi Gas Production Plant, SINOPEC Southwest Oilfield Company, Deyang, Sichuan 618000, China

Received:2012-01-10 Revised:2012-02-16 Online:2012-04-28 Published:2012-05-24

摘要/Abstract

摘要：

低渗透气藏产气量在我国天然气总产量中所占比例越来越大,但由于其气藏分布复杂、预测难度大等因素,阻碍了该类气藏的勘探开发进程。四川盆地川西坳陷上三叠统须家河组二段储层物性总体较差,属于低孔、低渗储层。以储层特征与成岩作用研究为基础,结合大量镜下薄片鉴定成果,确定了胶结物充填的序次及各期胶结物相对含量;并在各期胶结物中找出特征包裹体进行温度检测,结合储层埋藏史、热史等资料,确定了各期胶结物的形成时间与油气充注的时间及次序;此外,描述了储层孔隙在不同历史阶段的变化率与变化原因,从而再现了储层的形成历史,确定了储层致密化时间。最后,结合油气充注史,提出下一步有利勘探方向,为进一步油气勘探奠定了基础。

关键词: 成岩作用, 孔隙演化, 流体包裹体, 须家河组, 大邑地区, 川西坳陷, 四川盆地

Abstract:

The percentage of gas production from low-permeability gas reservoirs is increasing in China.However,the low-permeability gas reservoirs are geologically complex and can not be predicted easily,impeding their exploration and development.The second member of the Upper Triassic Xujiahe Formation in western Sichuan depression of Sichuan basin has poor poroperm characteristics as a whole and belongs to low porosity and permea-bility reservoirs.Based on the study of reservoir characteristics and diagenesis,this paper determines the filling sequence and relative content of cements of each stage through microscopic observation of thin sections.Characteri-stic inclusions are identified in cements of each stage and used to measure temperature.The results in combination with burial history and thermal history are used to determine the forming time of cements of each stage,hydrocarbon charging time and their sequences.In addition,the paper describes the rate and causes of porosity change in different periods,reconstructs the reservoir forming history and determines the time of reservoir tightening.Finally,this paper presents further exploration targets according to the analysis of hydrocarbon charging history.

Key words: diagenesis, porosity evolution, fluid inclusion, Xujiahe Formation, Dayi area, western Sichuan depression, Sichuan Basin

中图分类号:

TE122.2

罗文军,彭军,杜敬安,等. 川西坳陷须家河组二段致密砂岩储层成岩作用与孔隙演化——以大邑地区为例[J]. 石油与天然气地质, 2012, 33(2): 287-295,301. doi: 10.11743/ogg20120215 Luo Wenjun,Peng Jun,Du Jing’an,et al. Diagenesis and porosity evolution of tight sand reservoirs in the 2^nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region[J]. Oil & Gas Geology, 2012, 33(2): 287-295,301. doi: 10.11743/ogg20120215

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川西坳陷须家河组二段致密砂岩储层成岩作用与孔隙演化——以大邑地区为例

Diagenesis and porosity evolution of tight sand reservoirs in the 2^nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region

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川西坳陷须家河组二段致密砂岩储层成岩作用与孔隙演化——以大邑地区为例

Diagenesis and porosity evolution of tight sand reservoirs in the 2nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region

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Diagenesis and porosity evolution of tight sand reservoirs in the 2^nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region