塔西南山前地区柯克亚周缘叶探1井油气勘探重大突破及意义

doi:10.3969/j.issn.1672-7703.2024.04.001

摘要/Abstract

摘要： ：塔西南山前西昆仑冲断带柯东构造带叶探1 井在二叠系普斯格组获得重大突破，标志着塔西南山前地区发现一个重要的勘探接替层系。结合区域地质资料，根据野外露头、钻井、地震等综合研究，对柯克亚周缘二叠系普斯格组的成藏条件进行再认识。研究认为，研究区内二叠系普斯格组发育陆相湖泊—三角洲沉积体系，上段发育半深湖—深湖相烃源岩，面积1.0×10⁴km²，厚度最大达到800m，集中段有机质丰度为0.92%～1.16%，以菌藻类生源为主，有机质类型主要为Ⅱ型，有机质丰度高；普斯格组下段发育三角洲前缘、滨浅湖沙坝优质砂岩储层，砂体厚度为42.5～63m，砂地比为27%～47%，是一套分布较广的区域性储层，与普斯格组上段泥岩组成优质储盖组合；柯克亚周缘发育印支期、喜马拉雅期两期构造变形，古生界叠瓦冲断、强烈逆掩叠置，圈闭成排成带，喜马拉雅期进一步挤压抬升改造，局部复杂化，形成的叠瓦冲断带为勘探有利区。根据普斯格组天然气干燥系数分析，折算R_o 为
1.31%～1.42%，与下盘烃源岩成熟度相当，表明油气来自下盘逆掩叠置烃源岩，经历早油晚气的成藏过程，成藏具有“逆掩叠置下盘供烃、下生上储、断裂输导”的特点。综合分析认为该地区二叠系普斯格组圈闭成排成带分布，已发现圈闭9 个，面积301km²，天然气资源量约为2930×10⁸m³，凝析油资源量约为2×10⁸t，具有较好的勘探前景。

关键词: 塔西南山前地区, 柯克亚周缘, 二叠系普斯格组, 叶探1井, 重大发现, 成藏条件

Abstract: The Yetan1 well in Kedong tectonic belt, west Kunlun thrust belt in the front mountain of southwest area of Tarim Basin, has made a major breakthrough in the Permian Pusige Formation, marking the discovery of an important exploration successor system in southwest area of Tarim Basin. Based on the regional geological data and the field outcrop, drilling and seismic research, the reservoir-forming conditions of the Permian Pusige Formation sandstone around Kekeya are reunderstood. A new round of research holds that the upper member of Permian Pusige Formation has a semi-deep lacustrine facies source rock with an area of 1.0×10⁴km² and a maximum thickness of 800m. The organic matter abundance is 0.89%~1.5%. The source of organic matter is mainly bacteria and algae, and the type of organic matter is mainly type II. Hydrocarbon generation potential S₁+S₂ is 1.47-2.78mg/g. Due to the tectonic uplift of the Kunlun Mountains, the lower member of the Permian Pusige Formation in the periphery of Kekeya subdivision entered the continental sedimentary system, and the delta front and shoal shallow lake sand bar high-quality sandstone reservoirs developed in the lower submember II, withsand body thickness of 42.5-63m and sand-land ratio of 27%-47%, which are a set of widely distributed reservoirs. It is a high quality reservoir-cap association with lower submember I of Pusige Formation and upper mudstone member of Pusige Formation. According to the structural pattern analysis after drilling of Yetan 1 well, it is concluded that the Kekeya subperipheral developed two phases of Indosinian and Alpine tectonic deformation, Palaeozoic imbricated thrust, strong overthrust, trap rows and belts, and the further extrusion and uplift in the Alpine period were partially complicated, and the imbricated thrust belt formed is a favorable exploration area. According to the analysis of natural gas dryness coefficient of the Pusige Formation, the R_o is 1.31%-1.42%, which is similar to the maturity phase of the source rock, indicating that the oil and gas come from the foote overlying source rock and have undergone the accumulation process of early oil and late gas, and the accumulation has the characteristics of "hydrocarbon supply by the overlying foote, new layers produce and ancient layers storage, lower layers produce and upper layers storage, transport by fault ". Through re-comprehensive analysis, it is believed that the Permian Pusige Formation traps in this area are distributed in rows, and 9 traps are found, covering an area of 307.7km², with 286 billion square meters of natural gas resources and 143 million tons of condensate oil. Meanwhile, several favorable exploration targets such as PT1 well, PS1 well and PS2 well are selected and have great exploration prospects. It is expected to become an important replacement field for large-scale natural gas storage and production.

Key words: front Mountain of Southwest area of Tarim Basin;Kekeya peripheral, Permian Pusige Formation, YeTan 1 well, Reservoir forming conditions

中图分类号:

TE112.1

王清华, 杨海军, 李勇, 蔡振忠, 杨宪彰, 谢会文, 陈才, 孙春燕. 塔西南山前地区柯克亚周缘叶探1井油气勘探重大突破及意义[J]. 中国石油勘探, 2024, 29(4): 1-17.

Wang Qinghua, Yang Haijun, Li Yong, Cai Zhenzhong, Yang Xianzhang, Xie Huiwen, Chen Cai, Sun Chunyan. Significant discovery and significance of oil and gas exploration Well Yetan1 of Kekeya peripheral in the Front Mountain of Southwest area of Tarim Basin[J]. China Petroleum Exploration, 2024, 29(4): 1-17.

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