赤水地区二、三叠系碳酸盐岩气藏地质条件分析

Investigation on the Geologic Terms of Gas Pool within Carbonate Rocks in Permian and Triassic Marine Facies

赤水地区二、三叠系海相碳酸盐岩地层纵向上气源条件、储集条件、保存条件好及空间配置关系良好,并存在多套生储盖组合,即纵向上具有多套勘探目的层。目前该区经地面地质调查及二、三维数字地震发现构造圈闭19个,已钻探9个,正钻探1个,圈闭钻探率为52 63%。获探明储量31 27×108m3、控制储量15 44×108m3,两者仅占总资源量1210×108m3的3 86%。因此,从构造圈闭钻探率及已钻获储量分析,赤水地区二、三叠系海相酸盐岩地层还具有很大的勘探潜力。

Of carbonate rocks in Permian and Triassic marine facies in the Chishui area the strata vertically bear good relationship in gas source term, reservoir term, preserve term and spatial collocation as well, and several units of genetic, reservoir and cover compounding occur here, i.e. longitudinally, there exist multi-units exploration goal beds. At present, 19 structural traps in the area have been discovered through surface investigation and two- or three-dimensional digital seisms, of which drilling for 9 traps have been fulfilled and for one trap is undergoing, the trap- drilled ratio comes to 52.63 percent. Available identified reserve is 31.27×108m3 and control reserve is 15.44×108m3, but two parts account for 3.86 percent in total reserves 1210×108m3, it is indicated the strata of Permian and Triassic marine facies carbonate rocks in the Chishui area still accumulate quite prospecting potential according to the studies on the drilling proportion of the structural traps and drilled reserves.