摘要
根据塔里木盆地有关石炭系地层的地震资料、钻井资料和露头资料，将其分为3个三级沉积层序（CⅠ、CⅡ、CⅢ）和8个沉积体系域（CⅠ1、CⅠ2、CⅠ3、CⅡ1、CⅡ2、CⅡ3、CⅢ1、CⅢ2）。盆地相区的低水位沉积体系域和海侵沉积体系域较发育，而高水位沉积体系域不发育；台地相区的海侵沉积体系域和高水位沉积体系域较发育，而低水位沉积体系域缺失。按照层序地层学的观点认为，石炭纪时期的塔里木盆地主要为－具有盆、棚、凹、台结构的海盆。其岩相古地理的演化过程可分为3个演化周期和8个演化阶段，它们分别与沉积层序和沉积体系域相对应。储层主要形成于海侵期的海滩相砂岩、生屑滩相碳酸盐岩和高水位期的三角洲相砂岩、白云岩。油气勘探的有利区带主要为塔中隆起区、塔北斜坡区及麦盖提斜坡的中、西部地区。
Having analysed seismic, drilling and crop data of Carboniferous system in the Tarim basin, we divide Carboniferous system into three sedimentary sequences (CⅠ、 CⅡ、 CⅢ ) or eight depositional system tracts (CⅠ1、CⅠ2、C3、 CⅡ1、 CⅡ2、 CⅡ3、 CⅢ1、 CⅢ2 ). In basin facies area, lowstand and transgression depositional system tracts occur quite widely, but highstand depositional system tract does not. In platform facies area, transgression and highstand depositionaI system tracts exist wideLy； however, 1owstand depositional system tract is missing. Analysed in sequence stratigraphy, the Carboniferous Tarim basin was a seabasin where there were subbasins, sheLves, depressions and rises. The evolution process of the petrofacies palaeogeography consists of three cycles or eight phases, which correspond to sedimentary sequences or depositional system tracts respectively. The hydrocarbon reservoir may include beach-facies sandrock and carbonatite of biodetritus beach facies in transgression period, sandrock and dolomite of highstand delta facies. The favourable hydrocarbon exploration areas are mid-Tarim uplift,north-Tarim slope and mid-west part of Maigaiti slope.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1995年第4期535-545,共11页
Oil Geophysical Prospecting
关键词
层序地层学
沉积层序
岩相
古地理
石炭纪
sequence stratigraphy, sedimentary sequence, depositional system tract, petrofacies palaeogeography
