鄂尔多斯盆地东缘康宁地区二叠系致密储层成岩作用与孔隙度演化

doi:10.12108/yxyqc.20190207

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (2): 56–65.doi: 10.12108/yxyqc.20190207

鄂尔多斯盆地东缘康宁地区二叠系致密储层成岩作用与孔隙度演化

呼延钰莹^1,2, 姜福杰², 庞雄奇², 刘铁树³, 陈晓智³, 李龙龙^2,4, 邵新荷², 郑定业²

1. 中国地质科学院地球物理地球化学勘查研究所, 河北廊坊 065000;
2. 中国石油大学(北京)地球科学学院, 北京 102249;
3. 中海油研究总院有限责任公司, 北京 100028;
4. 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

收稿日期:2018-10-09 修回日期:2018-12-04 出版日期:2019-03-21 发布日期:2019-03-21
第一作者:呼延钰莹(1993-),女,硕士,主要从事储层沉积学与油气成藏方面的研究工作。地址:(065000)河北省廊坊市金光道84号物化探所。Email:huyanyuying@igge.com
通信作者: 姜福杰(1979-),男,博士,副教授,主要从事油气成藏机理与资源评价方面的教学和科研工作。Email:jiangfijwl@163.com。
基金资助:
国家自然科学基金重点基金“广泛连续型致密砂岩气藏成因机制与预测方法”（编号：U1262205）和中海石油（中国）有限公司综合科研项目“康宁—神府区块致密砂岩气成藏机理研究”（编号：YXKY-2016-ZY-04）联合资助

Diagenesis and porosity evolution of Permian tight reservoirs in Kangning area,eastern margin of Ordos Basin

HUYAN Yuying^1,2, JIANG Fujie², PANG Xiongqi², LIU Tieshu³, CHEN Xiaozhi³, LI Longlong^2,4, SHAO Xinhe², ZHENG Dingye²

1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, Hebei, China;
2. College of Geosciences, China University of Petroleum-Beijing, Beijing 102249, China;
3. CNOOC Research Institute Co., Ltd., Beijing 100028, China;
4. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214126, Jiangsu, China

Received:2018-10-09 Revised:2018-12-04 Online:2019-03-21 Published:2019-03-21

摘要/Abstract

摘要： 鄂尔多斯盆地东缘康宁地区具有广阔的天然气勘探前景，是我国致密气勘探开发的重点区域之一。为研究其储层成岩作用及致密化机理，开展了铸体薄片鉴定、扫描电镜分析、X射线衍射测试、粒度分析等研究，对二叠系致密储层的岩石成分、孔隙类型和成岩演化等进行了深入探讨。结果表明：①岩石类型以细-中粒长石岩屑砂岩和岩屑砂岩为主，石英体积分数平均49%，岩屑体积分数平均36%，长石体积分数平均15%；②储层物性以低孔-特低渗型为主，平均孔隙度为7%，平均渗透率为0.46 mD，为典型致密储层；孔径小，喉道细，分选差，以次生溶蚀孔隙为主；③二叠系砂岩经历了压实作用、胶结作用、溶蚀-交代作用，成岩阶段为中成岩A-B期。④压实作用是导致储层致密的主要因素，使得初始孔隙度减少了16.39%，碳酸盐胶结作用和黏土矿物的充填作用次之，使孔隙度减少了约12.30%，后期溶蚀作用使孔隙度增加了6.01%，这一结论与现今实测平均孔隙度平均值7.46%较为吻合。上述研究成果对研究区致密气藏勘探中寻找次生溶蚀"甜点"具有一定的参考价值。

关键词: 成岩作用, 孔隙度演化, 致密砂岩, 二叠系, 康宁地区, 鄂尔多斯盆地

Abstract: Giant natural gas potential exists in Kangning area in the eastern margin of Ordos Basin which is one of the tight sands gas targets in China. To investigate the diagenesis characteristics and genesis of densification, based on the data of thin sections,scanning electron microscope (SEM),X-ray diffraction,particle size analysis, the rock composition,pore type and diagenesis-porosity evolution process of Permian reservoirs were analyzed. The results show that reservoirs are dominated by fine-medium feldspathic lithic sandstone and lithic sandstone. The average content of quartz is 49%. Rock fragment and feldspar content is in average values of 36% and 15% respectively. The reservoirs are typical low porosity and extra-low permeability tight sandstone,with an average porosity of 7% and an average permeability of 0.46 mD. The pore diameter is small with fine throat and poor sorting. Additionally,secondary dissolved pore dominates the main pore system. The Permian sandstone reservoirs have experienced compaction,cementation and dissolution-replacement,which are divided into middle A-B diagenetic stage. Compaction is the key to cause the formation of tight reservoirs,resulting in a porosity loss of 16.39%. Second leading factor is carbonate cementation and clay mineral filling,which reduces porosity by 12.30%,whereas later dissolution increases porosity by 6.01%. The calculated porosity is almost equivalent to the measured average porosity of 7.46%. The above research results have a certain reference value for searching for secondary dissolution sweet spot in exploration of tight gas reservoirs in the study area.

Key words: diagenesis, porosity evolution, tight sandstone, Permian, Kangning area, Ordos Basin

中图分类号:

TE122.2

呼延钰莹, 姜福杰, 庞雄奇, 刘铁树, 陈晓智, 李龙龙, 邵新荷, 郑定业. 鄂尔多斯盆地东缘康宁地区二叠系致密储层成岩作用与孔隙度演化[J]. 岩性油气藏, 2019, 31(2): 56–65.

HUYAN Yuying, JIANG Fujie, PANG Xiongqi, LIU Tieshu, CHEN Xiaozhi, LI Longlong, SHAO Xinhe, ZHENG Dingye. Diagenesis and porosity evolution of Permian tight reservoirs in Kangning area,eastern margin of Ordos Basin[J]. Lithologic Reservoirs, 2019, 31(2): 56–65.

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鄂尔多斯盆地东缘康宁地区二叠系致密储层成岩作用与孔隙度演化

Diagenesis and porosity evolution of Permian tight reservoirs in Kangning area,eastern margin of Ordos Basin

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