四川盆地中部地区侏罗系沙溪庙组远源油气藏勘探开发前景

四川盆地中部地区侏罗系油区60年来勘探没有重大突破,被认为是贫矿。其中中侏罗统的沙溪庙组的主要产层为沙一段底部的一套席状砂体,直至1998年G16井获工业油流,及近年G003-H16井、G003-H18井、八角场地区多口井的获产,均证实了沙溪庙组中上部发育着具良好的勘探开发潜力的砂岩储层。通过岩心描述、薄片观察、测井解释及生产情况的综合分析,沙溪庙组中上部为三角洲前缘沉积环境中形成的河道砂体储层,属于受沉积相及裂缝控制的远源型油气藏,其物性条件相对席状砂体更优,生产产能及稳产能力相对更好。

There has been no major breakthrough in the exploration of the Jurassic oil area in the central part of the Sichuan Basin in the past 60 years. It is considered to be a poor ore. The main producing layer of the Shaximiao Formation in the Middle Jurassic is a set of sand bodies at the bottom of the Shahejie Formation. Until 1998, the G16 well received industrial oil flow, and in recent years, G003-H16 well, G003-H18 well and Bajiaochang, the production of multiple wells in the area has confirmed that sandstone reservoirs with good exploration and development potential are developed in the upper middle part of the Shaximiao Formation. Through the comprehensive analysis of core description, thin section observation, well logging interpretation and production situation, the upper part of Shaximiao Formation is a channel sand reservoir formed in the delta front sedimentary environment, belonging to the far-source oil and gas controlled by sedimentary facies and fractures. Its physical conditions are better than that of the mat sand body, and the production capacity and stable production capacity are relatively better.