鄂尔多斯盆地东南部长6油层组致密砂岩成岩作用及其孔隙度定量恢复

doi:10.12108/yxyqc.20210604

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 29–38.doi: 10.12108/yxyqc.20210604

鄂尔多斯盆地东南部长6油层组致密砂岩成岩作用及其孔隙度定量恢复

张玉晔^1,2, 高建武³, 赵靖舟^1,2, 张恒³, 吴和源^1,2, 韩载华⁴, 毛朝瑞^1,2, 杨晓^1,2

1. 西安石油大学地球科学与工程学院, 西安 710065;
2. 陕西省油气成藏地质学重点实验室, 西安 710065;
3. 延长油田股份有限公司七里村釆油厂, 陕西延安 717100;
4. 中国石油大学 (华东)地球科学与技术学院, 山东青岛 266580

收稿日期:2021-03-19 修回日期:2021-05-21 出版日期:2021-12-01 发布日期:2021-11-25
第一作者:张玉晔(1994-),女,西安石油大学在读硕士研究生,研究方向为油气成藏地质。地址:(710032)陕西省西安市西安石油大学。Email:18909464482@163.com。
基金资助:
陕西省自然科学基础研究计划项目“准连续型溶蚀—胶结作用致密机理：以苏里格地区二叠系砂岩为例”（编号：2020JQ-767）与陕西省教育厅重点科学研究计划项目“封闭—半封闭体系下成岩作用特征与砂岩致密成因机理研究：以苏里格气区二叠系为例”（编号：20JS128）联合资助

Diagenesis and pore evolution of Chang 6 tight sandstone reservoir in southeastern Ordos Basin

ZHANG Yuye^1,2, GAO Jianwu³, ZHAO Jingzhou^1,2, ZHANG Heng³, WU Heyuan^1,2, HAN Zaihua⁴, MAO Zhaorui^1,2, YANG Xiao^1,2

1. College of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. Key Laboratory of Shaanxi Province for Oil and Gas Accumulation Geology, Xi'an 710065, China;
3. Qilicun Oil Production Plant, Yanchang Oil Field Corporation, Yan'an 717100, Shaanxi, China;
4. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China

Received:2021-03-19 Revised:2021-05-21 Online:2021-12-01 Published:2021-11-25

摘要/Abstract

摘要： 鄂尔多斯盆地佛古塬区延长组长6油层组致密油储量丰富，但储层致密、非均质性强，从而导致油气勘探程度低。在岩心观察和薄片分析的基础上，综合运用扫描电镜、阴极发光及X射线衍射等方法，对研究区长6油层组的岩石学特征和成岩作用进行研究，并进一步对其孔隙度进行定量恢复。结果表明：研究区长6油层组岩性以灰白色长石细砂岩为主，储集空间以溶蚀次生孔和残余粒间孔为主，属于特低孔、超低渗的致密砂岩储层。成岩演化阶段为中成岩阶段A期，主要经历了压实、胶结、溶蚀和交代等成岩作用，且不同成岩作用对储层的孔隙发育具有不同影响。压实作用破坏了大量原生粒间孔，是导致研究区储层致密化的主要因素，孔隙度平均降低22.76%，减孔率达58.40%；胶结作用使储层孔隙度平均降低13.57%，减孔率达34.93%，其中晚期胶结作用是储层致密化的关键因素；溶蚀和交代作用产生了大量次生孔隙，从而改善了储层物性，增加的孔隙度平均为12.39%。该研究成果可为同类油田的进一步勘探开发提供一定借鉴。

关键词: 成岩作用, 孔隙度定量恢复, 致密砂岩, 延长组, 七里村油田, 鄂尔多斯盆地

Abstract: There are abundant tight oil reserves in Chang 6 reservoir of Yanchang Formation in Foguyuan area of Ordos Basin, but the tight reservoir and strong heterogeneity lead to low degree of oil and gas exploration. Based on core observation and thin section analysis, the petrological characteristics and diagenesis of Chang 6 reservoir in the study area were studied by means of scanning electron microscopy, cathodoluminescence and X-ray diffraction, and quantitative reconstruction of porosity was carried out. The results show that Chang 6 reservoir is mainly composed of grayish white feldspar fine sandstone, and the reservoir space is mainly dissolved secondary pores and residual intergranular pores, which belongs to ultra-low porosity and ultra-low permeability tight sandstone reservoir. Chang 6 reservoir has entered the middle diagenetic stage A, and has undergone diagenesis such as compaction, cementation, dissolution and metasomatism, and different diagenesis has affected the pore development of the reservoir with varying degrees. Compaction destroys a large number of primary intergranular pores, which is the main factor leading to the reservoir densification in the study area. The compaction causes an average reduction in porosity of 22.76% and a porosity reduction rate of 58.40%. The cementation causes the porosity to decrease by an average of 13.57%, with a porosity reduction rate of 34.93%, of which late cementation is the key factor for reservoir compaction. Dissolution and metasomatism produce a large number of secondary pores, thereby improving the physical properties of the reservoir, and the increased porosity is 12.39% on average. The research results can provide reference for the further exploration and development of similar oilfields.

Key words: diagenesis, quantitative reconstruction of porosity, tight sandstone, Yanchang Formation, Qilicun Oilfield, Ordos Basin

中图分类号:

TE122.2+1

张玉晔, 高建武, 赵靖舟, 张恒, 吴和源, 韩载华, 毛朝瑞, 杨晓. 鄂尔多斯盆地东南部长6油层组致密砂岩成岩作用及其孔隙度定量恢复[J]. 岩性油气藏, 2021, 33(6): 29–38.

ZHANG Yuye, GAO Jianwu, ZHAO Jingzhou, ZHANG Heng, WU Heyuan, HAN Zaihua, MAO Zhaorui, YANG Xiao. Diagenesis and pore evolution of Chang 6 tight sandstone reservoir in southeastern Ordos Basin[J]. Lithologic Reservoirs, 2021, 33(6): 29–38.

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鄂尔多斯盆地东南部长6油层组致密砂岩成岩作用及其孔隙度定量恢复

Diagenesis and pore evolution of Chang 6 tight sandstone reservoir in southeastern Ordos Basin

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