塔里木盆地东部碳酸盐岩储层特征与天然气勘探方向

发布时间：2018-07-03 17:22

本文选题：碳酸盐岩 + 天然气　；参考：《天然气地球科学》2016年05期

【摘要】：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。
[Abstract]:Carbonate rocks are developed in Ordovician, Cambrian and Sinian systems in the eastern part of Tarim Basin. The accumulative thickness of carbonate rocks is more than 2 000 m, which is the main carrier of oil and gas occurrence. In recent 5 years, natural gas exploration has been continuously discovered. According to the difference of geological horizon and lithofacies, the carbonate reservoir of Tadong is divided into five types: Ordovician platform limestone, Ordovician platform dolomite, Cambrian platform margin hilly body, Cambrian slope gravity flow deposition and Sinian dolomite. Based on the analysis of core, thin slice, experiment and logging data of more than 10 main exploration wells, it is concluded that Ordovician platform limestone can develop locally high quality reservoirs with fractures and cavities, and the reservoir conditions of Ordovician terrace dolomite are better than those of limestone. In the Cambrian platform margin, the superimposed reservoir thickness is large, the Cambrian slope can be developed with good reservoir performance and the gravity flow sedimentary reservoir is thicker, and the effective reservoir is also found in the dolomite of the Sinian system. The Ordovician limestone in Shunnan area and dolomite in ancient city area have been obtained industrial airflow respectively. The two regions can learn from each other's exploration experience to enlarge the scene. The new exploration well in the area of Cambrian platform margin of ancient city has been drilled into gas layer, which is the key point of dissection in the next few years. The Cambrian gravity flow sedimentary reservoir is relatively developed and has low-yield airflow on the Loxi slope. Through seismic facies analysis and reservoir prediction, gravity flow sedimentary reservoirs are also developed on the eastern slope of Gucheng city, which is of great exploration value. The development difference of dolomite in Sinian system is great, so it is necessary to continue to search for favorable karst reservoir distribution area.
【作者单位】：中国石油杭州地质研究院;中国石油集团碳酸盐岩储层重点实验室;中国石油勘探开发研究院研究生部;塔里木油田勘探开发研究院;
【基金】：国家油气专项“海相碳酸盐岩沉积与有效储集层大型化发育机理与分布研究”(编号:2011ZX05004-002) 中国石油天然气股份有限公司重大科技专项(编号:2014E-32-02) 中国石油天然气集团公司碳酸盐岩储层重点实验室联合资助
【分类号】：P618.13

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