石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (2): 199-206.doi: 10.11743/ogg20110206

• 石油与天然气地质 • 上一篇    下一篇

塔里木盆地塔中地区奥陶系碳酸盐岩储层主控因素

  

  • 出版日期:2011-04-28 发布日期:2011-09-26

Main controlling factors of the Ordovician carbonate reservoirs in Tazhong area, the Tarim Basin

  • Online:2011-04-28 Published:2011-09-26

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1102

被引次数

58

摘要：

摘要：利用岩心物性及岩心照片对比分析研究区两类储层的储集性能和储集空间特征，并通过储层纵横向分布及油气水赋存状态研究寻找优质储集体发育的主控因素。研究发现，受沉积相带和断裂活动显著控制的上奥陶统礁滩复合体储层呈现明显的层位性和分段性；而以不整合岩溶和断裂活动为主控因素的下奥陶统岩溶风化壳储层集中发育于不整合面下40～200 m深度范围内，分层性明显。综合对比两类优质储层发现，两类储层发育的关键作用不同，但储层总体呈现“横向连片，纵向叠置”的分布特征，储集性能相当。进一步分析认为，碳酸盐岩优质储层是在沉积〖KG-*4〗-改造双控作用下发育的。塔中西部平台区和塔中Ⅰ号带内带的岩溶次高地与岩溶上斜坡，具有优质储层发育的有利条件，是油气聚集的有利区带，勘探可继续向西、向内拓展。

关键词: 关键词：礁滩复合体, 岩溶风化壳, 碳酸盐岩储层, 沉积〖KG-*4〗-改造, 奥陶系, 塔中地区, 塔里木盆地

Abstract:

Abstract: By using the physical properties and core observation, this paper compares their reservoir qualities and characteristics of reservoir spaces in the study area. The main factors controlling the development of highquality reservoirs are also discussed based on study of the lateral and vertical distribution of reservoirs and the occurrence of oil, gas and water. The reefshoal complex reservoirs of the Upper Ordovician are significantly controlled by sedimentary facies belts and faults, thus show obvious characteristics of occurring at certain horizons and segmentation. In contrast, the karstweathering crust reservoirs of the Lower Ordovician are mainly controlled by faults and karstification along unconformities. They mainly occur within 40-200m under the unconformity, and show obvious layering features. A comprehensive comparison of these two kinds of quality reservoirs indicates that both of them feature in “lateral connection and vertical superimposition” and are similar in reservoir quality, though their major controlling factors are different. Moreover, the quality carbonate reservoirs are developed under the dual control of sedimentation and modification. The western platform as well as the subsidiary karst upland and upslope in the inner fault zoneⅠ in Tazhong area have favorable conditions for the development of highquality carbonate reservoirs, thus are play fairways.

Key words:  Key words： reefshoal complex, karstweathering crust, carbonate reservoir, sedimenttion and reformation, Ordovician, Tazhong area, Tarim Basin