鄂尔多斯盆地泾川地区中生界油气富集受控因素及勘探方向

Coutrol Factors of Oil and Gas Enrichment and Exploration Direction in Mesozoic of Jingchuan Area in Eerdiosi Basin

泾川地区位于鄂尔多斯盆地西南部，经历了晚三叠纪延长期的湖相、侏罗纪的河、沼相及白垩纪的河、湖相等多期、多类型的沉积演化，中生界发育多套有利的生储油岩系，具有广阔的油气勘探前景。印支晚期西高东低及燕山期西低东（南）高的构造反转控制了后期油气运聚的指向。区内自身油源及有效储层是油气成藏的重要因素。有利的沉积相带（砂体）与构造高部位的叠合是优选靶区和井位的主要依据。勘探方向：以北西-南东向油气有利聚集带为主要勘探部位，以长6油层组为主要目的层（兼探长5、长9、延9），重点寻找构造-岩性复合油藏。

Jingchuan area, located in southeast of Eerduosi basin, have experienced multistage and multi - type depositional evolution including lake facies of Yanchang stage in Late Triassic. fluviaI and paludal facics in Jurassic and nuvial and lake facies in Cretaceous.Mesozoic. with several sets of favorable oil sources and reservoir rocks, havc large exploration potential. Thestructure was high in the west and low in the cast inIndo - Chinese epoch, while it was low in the west and high in thc east (south), this structural inversion controlled the direction of oil and gas migration and accumulation later. The oil sources and effective reservoirs in this area were the important factors resulting in the formation of oil and gas pools. Combination of favorable sedimentary facies zones (sandbodies) with structural high is the main basis for area and well location selection. Exploration direction is selecting the favorable NW -SE oil and gas accumulation zone as the main exploration area and layer Chang 6 as the main target and focusing on search for structural-lithologic combination oil pools.