四川盆地雷口坡组膏盐岩成因及其油气地质意义

发布时间：2018-07-29 13:56

【摘要】：探讨四川盆地中三叠统雷口坡组膏盐岩的形成与分布及其对成烃和成储的影响。在岩心、薄片、测井和钻井等资料分析的基础上,对雷口坡组膏盐岩的岩石学特征、岩性组合特征和测井特征等开展研究发现,雷口坡组膏盐岩层系发育云岩+膏盐岩、膏岩+云岩、灰岩+膏盐岩、膏盐岩+灰岩4种组合类型,以及潮上塞卜哈、潮上小型蒸发盐盆、o_湖和蒸发盐盆4种成因模式。雷一段-雷二段面状展布的膏盐岩以塞卜哈成因为主,龙岗地区雷一段发育环带状展布的小型蒸发盐盆;雷三段发育以川中为中心、呈水滴式展布的o_湖成因膏盐岩;雷四段在川西南-川西地区发育牛眼式展布的蒸发盐盆成因膏盐岩。川西地区雷四段膏盐岩层系中发育有品质较好的烃源岩和以膏溶孔、洞为主要储集空间的岩溶储层,具备优越的油气地质条件,是下一步勘探的有利目标。
[Abstract]:The formation and distribution of gypsum salt rock and its influence on hydrocarbon generation and reservoir formation in the middle Triassic Leikoupo formation in Sichuan Basin are discussed. Based on the analysis of core, thin slice, logging and drilling data, the petrological characteristics, lithologic assemblage and logging characteristics of gypsum salt rock of the Lei Koupo formation are studied. It is found that the gypsum salt rock series of the Laikoupo formation is developed into dolomite gypsum salt rock. There are four types of assemblages of gypsum dolomite, limestone gypsum, gypsum limestone, and four genetic models of upper tide Sebha, small evaporative salt basin o _ lake and evaporative salt basin. The main gypsum rock distributed in the first and second member of the Lei formation is Sabha origin, the first section of the long Gang area has developed a small evaporative salt basin with circular belt distribution, the third section of the Lei formation is developed in the middle of Sichuan, and the olake type of olake salt is distributed in the middle of the area. The evaporative salt basin gypsum salt rock is developed in the southwest-west Sichuan area. Good quality source rock and karst reservoir with gypsum pore and cave as main reservoir space are developed in the gypsum rock series of the fourth member in western Sichuan area, which have superior oil and gas geological conditions and are favorable targets for exploration in the next step.
【作者单位】：中国石化西南油气分公司博士后科研工作站;中国石化西南油气分公司勘探开发研究院;
【基金】：中国石化重大科技攻关项目(P16092)
【分类号】：P588.247;P618.13

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