天然气地质学

构造挤压对砂岩储层垂向分布差异的控制——以库车前陆冲断带白垩系巴什基奇克组为例

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  • 1.中国石油大学地球科学学院,北京 102249;
    2.中国石油塔里木油田分公司勘探开发研究院,新疆 库尔勒 841000;
    3.中国石油大学油气资源与探测国家重点实验室,北京 102249
杨宪彰(1979-),男,甘肃镇原人,博士研究生,主要从事石油地质与沉积储层研究. E-mail:yangxztlm@petrochina.com.cn.

收稿日期: 2015-05-25

  修回日期: 2015-07-28

  网络出版日期: 2019-09-20

基金资助

国家科技重大专项(编号:2011ZX05003-004);国家重点基础研究发展计划(“973”)项目(编号:2011CB201104;2011CB201106);国家自然科学基金项目(编号:41302108)联合资助.

Tectonic compression controls the vertical property variation of sandstone reservoir:An example of Cretaceous Bashijiqike Formation in Kuqa foreland thrust belt,Tarim Basin

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  • 1.College of Geosciences,China University of Petroleum,Beijing 102249,China;
    2.Exploration and Development Research Institute of PetroChina Tarim Oilfield Company,Korla 841000,China;
    3.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China

Received date: 2015-05-25

  Revised date: 2015-07-28

  Online published: 2019-09-20

摘要

利用测井、岩心、薄片及孔渗数据,对库车前陆冲断带白垩系巴什基奇克组砂岩储层特征进行垂向对比分析发现,由上到下,储层物性显著变差。通过分析构造应力与成岩作用及储层物性之间的关系表明,构造挤压作用下,地层褶皱变形,由上到下,从局部张应力过渡为压扭应力,应力值逐渐增大;上部发育张裂缝,裂缝数量多、开度大,下部发育剪裂缝,裂缝数量少、开度小;受构造应力与裂缝影响,由上到下,储层压实增强,压实减孔量相差2%~3%,溶蚀变弱,溶蚀增孔量相差1%~2%,从而造成储层物性垂向分异。因此,储层垂向差异分布受构造挤压显著控制。认识构造挤压对储层垂向分布的控制,对深入理解成岩控制因素及预测挤压型盆地有利储层发育层段均具有重要意义。

本文引用格式

杨宪彰, 毛亚昆, 钟大康, 李勇, 能源, 孙海涛, 刘云龙 . 构造挤压对砂岩储层垂向分布差异的控制——以库车前陆冲断带白垩系巴什基奇克组为例[J]. 天然气地球科学, 2016 , 27(4) : 591 -599 . DOI: 10.11764/j.issn.1672-1926.2016.04.0591

Abstract

Various data including well logging,cores,thin sections,porosity and permeability were used to analyze the vertical variation of Bashijiqike sandstone reservoir in Kuqa foreland thrust belt.The Bashijiqike reservoir property becomes obviously worse from up to down.The relationship between tectonic stress,diagenesis,and pore development showed,the local tensile stress turned into torsional stress and the tectonic stress size gradually increased from up to down under the tectonic compression.Tension fissures with large fracture opening width are developed,whereas,fracture number decreases and shear fissures with small fracture opening width relatively increase down to the lower Bashijiqike Formation.Compaction enhances and dissolution decreases with the increase of tectonic stress size and development of fewer fractures,the reduced porosity by compaction and enhanced porosity by dissolution are approximately 2%-3% and 1%-2% respectively.So,the vertical difference is primarily determined by tectonic compression.The results help to further understand the diagenesis,and predict favorable reservoir distribution in compressional basins.

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