陇东地区三叠系长7段页岩油储层孔隙结构特征及成因机制

doi:10.12108/yxyqc.20220604

岩性油气藏 ›› 2022, Vol. 34 ›› Issue (6): 47–59.doi: 10.12108/yxyqc.20220604

陇东地区三叠系长7段页岩油储层孔隙结构特征及成因机制

文志刚^1,2, 罗雨舒^1,2, 刘江艳³, 赵春雨⁴, 李士祥³, 田伟超^1,2, 樊云鹏^1,2, 高和婷^1,2

1. 油气地球化学与环境湖北省重点实验室(长江大学资源与环境学院), 武汉 430100;
2. 油气资源与勘探技术教育部重点实验室 (长江大学), 武汉 430100;
3. 中国石油长庆油田分公司勘探开发研究院, 西安 710018;
4. 中国石油长庆油田分公司第十一采油厂, 甘肃庆阳 745100

收稿日期:2022-05-08 修回日期:2022-05-31 出版日期:2022-11-01 发布日期:2022-11-09
第一作者:文志刚(1965-),男,博士,教授,博士生导师,主要从事油气地球化学及石油地质学等方面的教学与研究工作。地址:(430100)湖北省武汉市蔡甸区蔡甸街大学路111号。Email:wzg728@sina.com
通信作者: 罗雨舒(1997-),女,长江大学在读硕士研究生,研究方向为油气地球化学。Email:3264713690@qq.com。
基金资助:
中国石油科技创新基金项目“砂砾岩致密油赋存特征及可动用性研究”（编号： 2020D-5007-0101）、中国博士后科学基金项目“砂砾岩致密油可动用性研究” （编号： 2020M682376）和国家科技重大专项“我国油气地质理论重大进展与未来需求”(编号： 2017ZX-05001005-002-001)联合资助

Pore structure characteristics and genetic mechanism of Triassic Chang 7 shale oil reservoir in Longdong area

WEN Zhigang^1,2, LUO Yushu^1,2, LIU Jiangyan³, ZHAO Chunyu⁴, LI Shixiang³, TIAN Weichao^1,2, FAN Yunpeng^1,2, GAO Heting^1,2

1. Hubei Key Laboratory of Petroleum Geochemistry and Environment(Yangtze University), Wuhan 430100, China;
2. Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University), Ministry of Education, Wuhan 430100, China;
3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi' an 710018, China;
4. No. 11 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, Gansu, China

Received:2022-05-08 Revised:2022-05-31 Online:2022-11-01 Published:2022-11-09

摘要/Abstract

摘要： 通过高压压汞、低温氮气吸附和核磁共振等实验，表征了鄂尔多斯盆地陇东地区三叠系长7段页岩油储层的孔隙结构特征，并探讨了成岩作用对孔隙结构的影响。研究结果表明：①陇东地区三叠系长7段页岩油储层主要为长石岩屑砂岩和岩屑长石砂岩，孔隙度平均为7.55%，渗透率平均为0.149 mD，属于典型的特低孔、超低渗储层，储集空间类型以溶蚀孔、残余粒间孔、黏土晶间孔为主，并发育少量微裂缝； ②储层整体排驱压力较高，为0.67～27.54 MPa，平均为5.54 MPa，最大进汞饱和度较低，为33.22%～84.35%，平均为64.71%，且平均喉道半径小，为0.008～0.163 μm，平均为0.277 μm，表现出强非均质性特征；③研究区典型样品的等温线形态均呈反“S”型，属于典型的Ⅳ型等温线，易出现H₃型“滞回环”现象，孔径小于200 nm的孔隙以平行板状为主；④研究区长7段页岩油储层的孔径大多小于30 μm，且随着样品物性的变好，储层内较大尺寸孔隙（大于200 nm）的占比逐渐增多；⑤研究区长7段页岩油储层经历了较强压实、较弱胶结与较弱溶蚀等3种成岩作用，其中胶结作用和压实作用具有负面影响，溶蚀作用对储层品质和孔隙结构的改善具有建设性作用。

关键词: 微观孔隙结构, 成岩作用, 成因机制, 页岩油储层, 长7, 三叠系, 陇东地区, 鄂尔多斯盆地

Abstract: The pore structure characteristics of Chang 7 shale oil reservoir were characterized by high pressure mercury injection（HPMI）， low-temperature nitrogen adsorption（LTNA）， and nuclear magnetic resonance（NMR）， and the effects of dominant diagenesis on pore structure were discussed. The results show that：（1）The shale oil reservoir of Triassic Chang 7 member in Longdong area is mainly feldspathic lithic sandstone and lithic arkose， with an average porosity of 7.55% and an average permeability of 0.149 mD，belonging to typical ultra-low porosity and ultra-low permeability reservoir. The reservoir space types are mainly dissolved pores， residual intergranular pores and clay intercrystalline pores， and a small amount of micro fractures are developed.（2）The reservoir is characterized by high displacement pressure， ranging from 0.67 MPa to 27.54 MPa， with an average of 5.54 MPa low maximum mercury saturation， ranging from 33.22% to 84.35%， with an average of 64.71%， and small average throat radius， ranging from 0.008 μm to 0.163 μm， with an average of 0.277 μm.， showing strong heterogeneity. （3）The isotherms of the typical samples in the study area are all in an inverse S shape， belonging to a typical type Ⅳ isotherm. The type of hysteresis loop is dominated by type H3，indicating that the shape of pores less than 200 nm is mainly parallel plate shape.（4）The pore diameter of Chang 7 shale oil reservoir in the study area is mostly less than 30 μm. With the improvement of physical properties of samples，the proportion of larger pores （greater than 200 nm）in the reservoir increases gradually.（5）The shale oil reservoir of Chang 7 member in the study area has experienced three types of diagenesis： strong compaction， weak cementation and weak dissolution. Cementation and compaction have a negative effect，and dissolution has a constructive effect on the improvement of reservoir quality and pore structure.

Key words: microscopic pore structure, genesis, genetic mechanism, shale oil reservoir, Chang 7 member, Triassic, Longdong area, Ordos Basin

中图分类号:

TE122.2

文志刚, 罗雨舒, 刘江艳, 赵春雨, 李士祥, 田伟超, 樊云鹏, 高和婷. 陇东地区三叠系长7段页岩油储层孔隙结构特征及成因机制[J]. 岩性油气藏, 2022, 34(6): 47–59.

WEN Zhigang, LUO Yushu, LIU Jiangyan, ZHAO Chunyu, LI Shixiang, TIAN Weichao, FAN Yunpeng, GAO Heting. Pore structure characteristics and genetic mechanism of Triassic Chang 7 shale oil reservoir in Longdong area[J]. Lithologic Reservoirs, 2022, 34(6): 47–59.

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陇东地区三叠系长7段页岩油储层孔隙结构特征及成因机制

Pore structure characteristics and genetic mechanism of Triassic Chang 7 shale oil reservoir in Longdong area

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