延安地区二叠系山西组1段页岩气储层特征及勘探开发关键技术

doi:10.3969/j.issn.1672-7703.2022.03.010

摘要/Abstract

摘要： 延安地区二叠系山西组1段（山1段）陆相页岩气资源丰富，但泥页岩储层非均质性强，成藏条件复杂。为明确该区页岩气勘探潜力，应用钻井、测井、压裂、岩心及分析测试等资料，围绕山1段页岩气地质和工程特点，开展系统研究和技术攻关，创建陆相页岩气勘探开发关键技术。研究表明：山1段砂泥岩互层发育，横向相变频繁，泥页岩普遍含气，相邻的砂岩也含气，具有砂岩、泥岩混合，复合成藏的特征；山1段泥页岩累计厚度平均为25m，地层压力系数为0.82；泥页岩中有机质类型以Ⅲ型干酪根为主，R_o在2.33%～2.85%之间，泥页岩中主要发育4种孔隙、两种裂缝，泥页岩解析气含量平均为1.2m³/t；相邻的砂岩含气饱和度平均为45%，孔隙度平均值为7.2%。通过集成创新，初步形成了陆相页岩气“三品质”测井评价技术、页岩气储层识别及随钻地质导向技术、低成本水平井优快钻井技术、水平井CO2混合体积压裂工艺技术等勘探开发关键技术，有力支撑了延安地区页岩气勘探开发工作。现场实施的3口水平井钻井周期降低11.3%，薄层砂岩钻遇率平均超过75%，无阻流量突破6×10⁴m³/d。

关键词: 鄂尔多斯盆地, 延安地区, 山1段, 泥页岩, 储层特征, 勘探开发, 关键技术

Abstract: There are abundant shale gas resources in the first member of the Permian Shanxi Formation (Shan 1 member) in Yan’an area. However, the shale reservoir has strong heterogeneity and the geological conditions for gas accumulation are complex. There are abundant shale gas resources in the first member of the Permian Shanxi Formation (Shan 1 member) in Yan’an area. However, the shale reservoir has strong heterogeneity and the geological conditions for gas accumulation are complex. Based on the geological and engineering characteristics of shale gas in Shan 1 member, systematic study and technology research are conducted by using drilling, logging, fracturing, core experiment and well testing data, so as to identify the exploration potential of shale gas in the study area. In addition, key technologies for the exploration and development of continental shale gas are developed. The results show that the interbedding of sand and shale is developed in Shan 1 member with rapid lithofacies changes laterally. The shale is generally gas-bearing, as well as the adjacent sandstone, which is characterized by the mixture of sand and shale and compound gas accumulation. The cumulative shale thickness of Shan 1 member is 25m on average, and the formation pressure coefficient is 0.82. The organic matter is dominated by Type III kerogen, with R_o of between 2.33%-2.85%. Four types of pores and two types of fractures are developed in shale, and the average content of desorption gas is 1.2m³/t. The average gas saturation of the adjacent sandstone is 45%, and the average porosity is 7.2%. The integrated and innovative researches enable to initially develop a series of key technologies, such as “three qualities” logging evaluation of continental shale gas, shale gas reservoir recognition and geosteering while drilling, optimal and fast drilling of horizontal well with low cost, and CO₂ mixed volume fracturing of horizontal well, which strongly support shale gas exploration and development in Yan’an area. Three horizontal wells have been drilled, with drilling time decrease of 11.3%, average thin sandstones penetration rate of more than 75%, and an open flow rate of more than 6×10⁴m³/d.

中图分类号:

TE112.23

孙建博, 郝世彦, 赵谦平, 罗腾跃, 姜磊, 高潮, 郭超, 尹锦涛, 刘刚, 徐杰. 延安地区二叠系山西组1段页岩气储层特征及勘探开发关键技术[J]. 中国石油勘探, 2022, 27(3): 110-120.

Sun Jianbo, Hao Shiyan, Zhao Qianping, Luo Tengyue, Jiang Lei, Gao Chao, Guo Chao, Yin Jintao, Liu Gang, Xu Jie. Reservoir characteristics and key technologies for shale gas exploration and development of the first member of the Permian Shanxi Formation in Yan’an area[J]. China Petroleum Exploration, 2022, 27(3): 110-120.

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