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塔里木盆地西南坳陷麦盖提斜坡石炭系碳酸盐岩 (Tg2′和Tg2″反射波组 )非均质性严重 ,非储集层段基本为强振幅连续微地震相 ,而储集层发育段为弱振幅的连续或不连续反射微地震相。利用目的层微地震相特征 ,可寻找有利的碳酸盐岩储集层发育带。根据井下碳酸盐岩储集层发育段与过井地震剖面的地震 地质层位标定结果 ,建立了麦盖提斜坡微地震相特征与碳酸盐岩储集层发育段的相关模式。对斜坡西部群苦恰克地区石炭系小海子灰岩段底的Tg2′反射波组和斜坡东部石炭系巴楚组生屑灰岩段底的Tg2″反射波组进行微地震相分析 ,结合已知井下碳酸盐岩沉积相与储集层发育特征、储集层所处构造 (古构造、现今构造 )位置 ,预测碳酸盐岩储集层发育有利地区。研究认为 :群苦恰克地区石炭系小海子灰岩段岩溶发育带主要分布在巴什托普背斜构造带的西南翼 ;玛扎塔克构造带以南地区石炭系巴楚组生屑灰岩段有利储集层发育区主要分布在该区 4个潜山区及其附近。图 3参 2
Carboniferous carbonates (Tg2 ’and Tg2 “reflection waves) in the Maigaiti slope in the southwestern depression of the Tarim Basin are characterized by serious heterogeneity. The non-reservoir section is basically a strong amplitude continuous microseismic phase, while the reservoir is developed Seismic facies analysis shows that the seismic facies can be divided into three types: the continuous seismic facies and the discontinuous seismic facies with weak amplitudes.According to the microseismic facies characteristics of the target layer, favorable carbonate reservoir development zones can be found.According to the well- The result of the calibration of the seismic geologic horizon shows that the correlation between the microseismic facies and the developmental stages of carbonate reservoirs in the Maigaiti slope is established.At the end of the section of the Xiaoshizi limestone in the Kuchak region of the western slope of the slope Tg2 ’reflection wave group and the Tg2 ”reflection wave group at the base of bioclastic limestone in the Bachu Formation in the east slope of the slope. Based on the microseismic phase analysis of the known carbonate sedimentary facies and reservoir characteristics, The tectonic setting (palaeo-tectonic, present-day tectonic) located in the tectonic setting predicts a favorable area for the development of carbonate reservoirs. It is concluded that the karst development zones of the Xiaoshizi limestone section of the Qunke area are mainly distributed in the southwestern wing of the Bashishopo anticline tectonic belt and the Carboniferous Bachu Formation in the south of the Mazhakedak tectonic belt The favorable reservoir development zones of the rock sections are mainly distributed in and around 4 buried hill areas in this area. Figure 3 Reference 2