鄂尔多斯盆地环庆地区三叠系长8致密砂岩储层特征及成藏主控因素

doi:10.12108/yxyqc.20250303

岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 23–32.doi: 10.12108/yxyqc.20250303

• 地质勘探 • 上一篇

鄂尔多斯盆地环庆地区三叠系长8致密砂岩储层特征及成藏主控因素

肖文华, 杨军, 严宝年, 王建国, 李少勇, 马淇琳, 李宗霖, 薛欢召

中国石油玉门油田公司勘探开发研究院, 甘肃酒泉 735019

收稿日期:2024-07-22 修回日期:2025-02-19 发布日期:2025-05-10
第一作者:肖文华（1975—），男，硕士，高级工程师，主要从事油气勘探与开发方面的工作。地址：（735019）甘肃省酒泉市肃州区飞天路玉门油田指挥中心2号楼1509。Email：xiaowh@petrochina.com.cn。
基金资助:
中国石油天然气股份有限公司玉门油田公司科技项目“鄂尔多斯玉门区块中生界有利目标评价与产能建设部署研究”（YM2024-002）资助。

Characteristics and main controlling factors of Triassic Chang 8 tight sandstone reservoir in Huanqing area，Ordos Basin

XIAO Wenhua, YANG Jun, YAN Baonian, WANG Jianguo, LI Shaoyong, MA Qilin, LI Zonglin, XUE Huanzhao

Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China

Received:2024-07-22 Revised:2025-02-19 Published:2025-05-10

摘要/Abstract

摘要： 综合利用钻井、测井、岩心等资料，通过薄片观察、压汞实验、核磁共振等方法对鄂尔多斯盆地环庆地区三叠系长8致密砂岩储层特征及形成机制进行了分析，并明确了其致密油的富集主控因素。研究结果表明：①环庆地区长8致密砂岩储层主要为岩屑长石砂岩与长石岩屑砂岩，成份成熟度较低，平均为0.97；储集空间类型主要为次生孔隙，还可见残余粒间孔及高岭石晶间孔；孔隙度主要为5.50%～12.60%，平均为9.50%，渗透率主要为0.09～3.43 mD，平均为0.79 mD；储层孔隙结构整体较差，平均孔喉半径为0.12～0.16 μm，油层最大孔喉半径为0.49～0.62 μm，较高渗透率主要由大孔喉贡献。②研究区长8储层在早成岩阶段A期，钙碳酸盐过饱和压释水进入砂质沉积物，形成钙质胶结致密砂岩，胶结物主要为方解石；中成岩阶段A期，有机酸流体沿生烃增压缝注入致密砂岩中，溶蚀方解石胶结物和长石碎屑颗粒，形成了部分储集空间。③研究区长8致密油藏的形成受控于斜坡背景、优质烃源岩、大面积分布的河道砂体及良好的源-储配置，油气集中分布在靠近烃源岩的致密砂岩储层中，砂岩厚度越大，含油性越好。

关键词: 方解石胶结物, 次生孔隙, 致密砂岩, 近源成藏, 长8段, 三叠系, 环庆地区, 鄂尔多斯盆地

Abstract: Based on the data of drilling，logging and core，the characteristics and formation mechanism of Triassic Chang 8 tight sandstone reservoir in Huanqing area of Ordos Basin were analyzed by thin section observation，mercury intrusion experiment，nuclear magnetic resonance，then the main controlling factors for enrichment of tight oil were clarified. The results show that：（1）Chang 8 tight sandstone reservoir in Huanqing area is mainly composed of lithic feldspar sandstone and feldspar lithic sandstone，with low compositional maturity （average 0.97）. The main reservoir space types are secondary pores，and intragranular pores and kaolinite intergranular pores can be seen . The porosity ranges from 5.50% to 12.60%，with an average value of 9.50%. The permeability ranges from 0.09 mD to 3.43 mD，with an average value of 0.79 mD. The reservoir is commonly of small pore throat radius，with an average pore throat radius of 0.12-0.16 um and the maximum pore throat radius of 0.49-0.62 μm. The high permeability is mainly contributed by the large pore throat.（2）The evolution about diagenetic and reservoir of Chang 8 reservoir in the study area are as follow. In the early diagenetic stage A，calcareous cemented tight sandstone was formed by injection of calcareous carbonate supersaturated pressure release water into sandy sediments，and the cementation was mainly calcite. In the middle diagenetic stage A，the organic acid fluid was injected into the tight sandstone along the hydrocarbon generation pressurized fracture to dissolve calcite cementation and feldspar detrital particles，and some of the reservoir space were formed.（3）The formation of Chang 8 tight oil reservoirs are controlled by slope background，high-quality source rocks，largescale distribution of river sand bodies and good source-reservoir configuration.The oil and gas are concentrated in the tight sandstone reservoirs close to the source rocks，and the sandstone with large thickness has a better oily content.

Key words: calcite cement, secondary pores, tight sandstone, near-source accumulation, Chang 8, Triassic, Huanqing area, Ordos Basin

中图分类号:

TE122.2

肖文华, 杨军, 严宝年, 王建国, 李少勇, 马淇琳, 李宗霖, 薛欢召. 鄂尔多斯盆地环庆地区三叠系长8致密砂岩储层特征及成藏主控因素[J]. 岩性油气藏, 2025, 37(3): 23–32.

XIAO Wenhua, YANG Jun, YAN Baonian, WANG Jianguo, LI Shaoyong, MA Qilin, LI Zonglin, XUE Huanzhao. Characteristics and main controlling factors of Triassic Chang 8 tight sandstone reservoir in Huanqing area，Ordos Basin[J]. Lithologic Reservoirs, 2025, 37(3): 23–32.

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鄂尔多斯盆地环庆地区三叠系长8致密砂岩储层特征及成藏主控因素

Characteristics and main controlling factors of Triassic Chang 8 tight sandstone reservoir in Huanqing area，Ordos Basin

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