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塔里木盆地东部的奥陶系、寒武系、震旦系发育碳酸盐岩,累计厚度最大超过2 000m,是油气赋存的主要载体,近5年来天然气勘探不断有发现。根据地质层位与岩相差异,将塔东碳酸盐岩储层划分为奥陶系台地石灰岩、奥陶系台地白云岩、寒武系台缘丘滩体、寒武系斜坡重力流沉积及震旦系白云岩等5大类。通过10余口主要探井的岩心、薄片、实验及测录井等资料分析,认为奥陶系台地石灰岩可局部发育缝洞优质储层,奥陶系台地白云岩储集条件整体优于石灰岩,寒武系台缘丘滩体储层叠加厚度大,寒武系斜坡可发育储集性能良好、厚度较大的重力流沉积储层,震旦系白云岩中也发现了有效储层。顺南地区奥陶系石灰岩、古城地区白云岩分别已获工业气流,2个地区可相互借鉴勘探经验以扩大场面。古城寒武系台缘丘滩体领域的新探井已钻遇气层,是今后几年解剖的重点。罗西斜坡寒武系重力流沉积储层较发育,并有低产气流。经地震相分析和储层预测,古城东斜坡也发育重力流沉积沉积储层,具有较大的勘探价值。震旦系白云岩发育差异大,需要继续寻找有利岩溶储层分布区。
The Ordovician, Cambrian and Sinian carbonate rocks developed in the eastern Tarim Basin accumulate a maximum of over 2 000 m in thickness, which is the main carrier for oil and gas accumulation. Natural gas exploration has been continuously discovered in the past five years. According to the difference of geological strata and lithofacies, the East Tadong carbonate reservoir is divided into Ordovician platform limestone, Ordovician platform dolomite, Cambrian margin edge beach body, Cambrian slope gravity flow deposition and Sinian Dolomites and other five categories. Based on the analysis of core, thin slice, experiment and logging data of more than 10 major exploration wells, it is considered that the high quality reservoirs in the Ordovician platform limestone can be partially developed, and the accumulation conditions of Ordovician platform dolomite are better than limestone in general The thickness of superposition thickness of reservoirs in the rim of the Wuyuan platform marginal pools is good. Cambrian slope can develop reservoirs with good reservoir properties and thick gravitational flow, and effective reservoirs are also found in the Sinian dolomite. The Ordovician limestone in Shunnan area and the dolomite in the ancient city have been respectively industrialized and the two regions can learn from each other’s exploration experience to expand the scene. The new exploratory wells in the Cambrian tectonic edge of the ancient city have been drilled by the gas layer, which is the focus of the dissection in the next few years. Cambrian slope of the Cambrian gravity flow sedimentary reservoir development, and low-yield airflow. After seismic facies analysis and reservoir prediction, gravity flow depositional sedimentary reservoirs are also developed in the east slope of the ancient city, which has great exploration value. Sinian dolomite development is very different, need to continue to find favorable karst reservoir distribution area.