大牛地气田马家沟组马五6-7亚段气水层测井响应特征及分布规律主控因素  

Logging Response Characteristics and Main Controlling Factors of Distribution of Gas-water Layers in Ma5 Sub-member 6-7 of Majiagou Formation in Daniudi Gas Field

作　　者：高淑敏 范云杰 朱俊阳 敬俊 Gao Shumin;Fan Yunjie;Zhu Junyang;Jing Jun(State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering,Chengdu Sichuan 610059;Chengdu University of Technology,Chengdu Sichuan 610059)

机构地区：[1]油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学,四川成都610059

出　　处：《中外能源》2025年第2期50-56,共7页Sino-Global Energy

摘　　要：大牛地气田马家沟组马五段主要发育碳酸盐岩岩溶储层,气水关系复杂,气水识别困难,制约了该区的天然气生产。通过对不同类型储层的分析以及产气量大小划分气水层,明确气层、含水气层、气水同层及水层的测井响应特征,并结合地层水化学特征、储层类型明确气水分布主控因素。结果表明:研究区马家沟组马五6-7亚段气层具有高深侧向电阻、高声波时差、低密度、低自然伽马等测井响应特征。研究区地层水为氯化钙型,是经长时间地层内循环,水岩作用后高度变质的高浓度蒸发卤水。气水分布受控于地层水、断裂、储层类型,研究区地层水矿化度高,钠氯系数较低,水体稳定,是烃类聚集和保存的有利区;层间走滑断裂、孔洞型储层及孔缝型储层发育区域,气层、含水气层占比大;基底复活断裂及孔隙型储层发育区域,气水同层和水层占比大。Carbonate karst reservoirs are mainly developed in Ma5 Member of the Majiagou Formation in the Daniudi Gas Field.The gas-water relationship is complicated and hard to identify,restricting natural gas production in this area.The gas-water layers are divided according to the analysis of various types of reservoirs and gas production,the logging response characteristics of the gas layer,water-bearing gas layer,gas-water co-layer,and water layer are clarified,and the main controlling factors of gas-water distribution are determined based on the formation water chemical characteristics and reservoir types.The results show that the gas reservoirs in Ma5 Sub-member 6-7,Majiagou Formation in the study area have the logging response characteristics of high depth lateral resistance,high acoustic time dfference,low density,and low natural gamma ray.The formation water in the study area is calcium chloride type,a high-concentration evaporative brine with high metamorphism after a long period of intra-formation circulation and water-rock interaction.The distribution of gas and water is controlled by formation water,fracture,and reservoir type.The formation water in the study area is favorable for hydrocarbon accumulation and preservation with high salinity,low sodium chloride coefficient,and stable water body.The proportion of gas and water-bearing gas reservoirs is large in the interlayer strike-slip fault,vug-type reservoirs,and fracture-cavity-type reservoirs.The proportion of gas-water and water reservoirs is large in the basement reactivation faults and pore reservoirs.

关 键 词：气水分布 地层水 测井响应特征 断裂 储层类型 大牛地气田 

分 类 号：P618.13[天文地球—矿床学] P631.81[天文地球—地质学]