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四川盆地上三叠统须家河组是中国石油西南油气田公司的重点勘探接替层系,随着勘探形势的变化,需要以全盆地为单元,弄清各储集砂体的平面展布规律及其勘探潜力。综合分析地震、测井、录井和野外露头资料,将须家河组划分为4个三级层序、12个体系域;以体系域为单元编制了全盆地须家河组沉积微相展布图,指出须家河组形成了6大三角洲砂体,有利储集砂体主要分布于低位体系域,主要为三角洲前缘水下分支河道砂体;而水进和高位体系域湖泊相沉积发育,砂体规模较小。综合考虑各砂体的分布面积、生烃强度、资源潜力、储层类别、勘探现状及顶面埋深等条件,对须家河组进行了勘探潜力综合评价,指出了下一步的勘探方向:①须二段应集中在广安—营山和蓬莱—金华2个砂体上;②须四段应集中在蓬莱—金华、安岳—合川2个砂体上;③须六段则应集中在勘探程度相对较低的蓬莱—金华、宜宾—观音场和古蔺—泸州砂体上。
The Upper Triassic Xujiahe Formation in Sichuan Basin is a key exploration succession strata of the Southwest Oil and Gasfield Company of PetroChina. As the exploration situation changes, it is necessary to take the whole basin as a unit to find out the law of plane distribution of each reservoir sand body and to find out, Its exploration potential. By comprehensively analyzing the data of earthquakes, logging, logging and field outcrops, the Xujiahe Formation is divided into four third-order sequences and 12 systematic fields. The sedimentary microfacies of Xujiahe Formation It is pointed out that six large deltaic sand bodies are formed in the Xujiahe Formation, and the favorable reservoir sand bodies are mainly distributed in the lower system tract, which is mainly the subaqueous distributary channel sand bodies in the delta front; and the lacustrine facies sediments Development, sand body smaller scale. Comprehensively considering the distribution area, hydrocarbon generation intensity, resource potential, reservoir type, exploration status and top burial depth of each sand body, the comprehensive evaluation of exploration potential of Xujiahe Formation is made and the next exploration direction is pointed out: ① The second member should be concentrated in Guangan - Yingshan and Penglai - Jinhua 2 sand bodies; ② Four sections should be concentrated in Penglai - Jinhua, Anyue - Hechuan 2 sand body; ③ to be six sections should be focused on Exploration of relatively low Penglai - Jinhua, Yibin - Guanyin Field and Gulin - Luzhou sand body.