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为寻找四川盆地川西地区天然气勘探新区块、新领域,通过分析区内10余条地质露头剖面、40多口井的钻井资料及大联片地震资料,建立了地质露头、钻井和地震3套构造层序、6套沉积层序。提出区内经历了陆缘海湾型沉积、海陆过渡型沉积和封闭—半封闭的前陆盆地型沉积,在上述盆地中分别发育了不同的沉积体系和砂体,构成不同的含油气组合与油气藏类型。进而建议:①勘探重点应从目前的主攻上三叠统须家河组二段转移到须家河组四、六段;②从主攻须家河组转移到海陆并举,兼顾陆相(侏罗系红层);③从背斜圈闭转移到探索非背斜圈闭与页岩气藏。勘探区块也相应从邛西、平落坝、白马、松华区块转移到雾中山、莲花山区块,以及大邑、灌口、苏码头、盐井沟、眉山、汉王区块。勘探方法、研究思路、工程及工艺措施也相应需要更新。
In order to search for new blocks and new fields of natural gas exploration in the western Sichuan area of Sichuan Basin, three sets of geological outcrops, drilling wells and earthquakes have been set up by analyzing more than 10 geological outcrop sections and drilling data from more than 40 wells and data from the Great - Sequence, 6 sets of sedimentary sequence. It is suggested that there are continental margin sediments, transitional land-sea sediments and closed-semi-closed foreland basin-type sediments in the area. Different sedimentary systems and sand bodies are developed in these basins to form different oil-gas combination and hydrocarbon Type of possession. Furthermore, it is suggested that: (1) Exploration emphasis should be shifted from the main section of the Upper Triassic Xujiahe Formation to the fourth and sixth sections of the Xujiahe Formation; (2) the main Xujiahe Formation should be relocated to both land and sea, Red beds); (3) shifting from anticlinal traps to exploring non-anticline traps and shale gas reservoirs. Correspondingly, the exploration blocks were transferred from Wusi, Pingluoba, Baima and Songhua blocks to Wulishan and Lianhua Mountain blocks and Dayi, Guankou, Sufangtou, Yanjinggou, Meishan and Hanwang blocks. Exploration methods, research ideas, engineering and technological measures also need to be updated accordingly.