大邑构造雷口坡组四段天然气成藏条件  

Natural Gas Accumulation Conditions ofthe 4^(th) Member in Leikoupo Formation of Dayi Structure

作　　者：陈迎宾[1] 胡烨[1] 王彦青[1] 曾华盛[1] 

机构地区：[1]中国石化石油勘探开发研究院,江苏无锡214126

出　　处：《特种油气藏》2016年第3期25-29,152,共5页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"大型油气田及煤层气开发"之"海相碳酸盐岩层系盆地分析与战略选区"(2016ZX05005-001-005)

摘　　要：以区域地质研究为基础,通过三维地震解释及有机地球化学分析等技术手段,综合分析了大邑构造雷口坡组四段天然气成藏条件及其勘探潜力。研究结果表明,大邑地区二叠系及雷口坡组烃源岩发育,深大断裂及不整合面可作为油气运移的良好通道,天然气成藏具有"双源供烃"的良好气源条件。雷口坡组四段发育台缘滩沉积,基质孔渗性较好,加之后期风化淋滤及构造变形,推断发育孔隙-缝洞复合型优质储层。发育于构造轴部的1号断鼻圈闭面积大、幅度高,具备良好的封盖及保存条件。雷口坡组四段圈闭、储层形成时间早,具有"下生上储式"、"自生自储式"良好的生储盖组合,是川西雷口坡组天然气勘探的一个新的有利目标。Based on regional geology research,3D seismic interpretation,organic geochemical analysis and other technical methods are used to comprehensively analyze the natural gas accumulation conditions and exploration potential of the 4^(th)Member in Leikoupo Formation of Dayi Structure. Research shows that source-rock is well-developed in Permian and Leikoupo formations of Dayi Structure,the deep faults and unconformities can be regarded as favorable channels for hydrocarbon migration and the natural gas accumulation is featured by favorable gas source of'dual-source hydrocarbon supply'. Platform- margin beach deposition with relatively high porosity- permeability develops in Leikoupo Formation,coupling with the late weathering leaching and structural deformation,it is interred that there are well-developed pore-fracture-cave compound high-quality reservoirs. The No.1 fault-nose trap develops in the structural axis is characterized by large area,high amplitude,favorable sealing conditions and preservation conditions. The 4^(th)Member trap in Leikoupo Formation are featured by early development and favorable source-reservoir-seal combinations o'flower-generation and upper-preservation'and'self-generation and self-preservation',which is considered as a new favorable natural gas exploration area in Leikoupo formation.

关 键 词：成藏条件 地球化学 大邑构造 雷口坡组 川西坳陷 

分 类 号：TE121.1[石油与天然气工程—油气勘探]