东准噶尔滴西地区石炭系火成岩岩相特征及分布预测

含油气火成岩储层的研究为石油勘探开拓了更广阔的前景。东准噶尔滴西地区石炭系火成岩气藏是克拉美丽气田的主体部分,位于陆梁隆起东南部的滴南凸起西端。根据钻井取心、薄片观察及成像测井数据,对滴西地区石炭系的火成岩岩性进行了识别和类型划分; 结合测井、地震等资料,在单井相划分的基础上,以井震结合为方法,建立了不同岩相的地震相模式,并对其不同特征进行了分析; 通过建立地质-地震对应关系,运用时间切片、波形分类等地震属性分析技术对研究区岩相分布进行了预测。研究结果表明滴西地区火成岩发育火山通道相、爆发相、溢流相、火山沉积相和侵入相五种岩相; 研究区火山岩岩相分区性明显,整体呈现西北部以中-基性溢流相为主,中部以爆发相和火山沉积相为主、东南部以中-酸性溢流相为主的分布特点,滴西18井区为独立的侵入岩体,为浅成侵入相。

Characteristics and distribution prediction of lithofacies of Carboniferous igneous rocks in Dixi area, East Junggar

The researches on oil-and gas-bearing volcanic rocks have largely developed the foreground of oil exploration. Gas reservoirs in Carboniferous igneous rocks of Dixi area is the main production part of Kelameili gas field, which located in the west of Dina uplift, southeast of Luliang uplift. In this study, igneous lithologies in Dixi area are identified and classified using core observation, cuttings slice analysis and FMI rock texture and structural interpretations; On the basis of single-well lithologic identification and lithofacies division, combined with well logging and seismic data, established the seismic facie models of different lithofacies and the characteristics are analysed; Take the advantage the relationship between geology and seismic data, the distribution of igneous lithofacies are predicted using seismic attribute analysis, including wave analysis and time slice. The results show that there are volcanic channel facies, eruption facies, overflow facies, volcanic sedimentary facies and intrusive facies developed, intermediate-basic overflow facies are mainly distributed in the Northwest area and intermediate-acid overflow facies are mainly distributed in the Southeast, the middle part of Dixi area mainly developed eruption facies and volcanic sedimentary facies, a separate intrusive body is developed in Dixi 18 well block, and is shallow intrusive facies.