The research and application of the reservoir controlling mechanism for the No.2 Fracture Zone, Weixi’nan Sag
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摘要: 涠西南凹陷是勘探开发一体化研究重点区，本文以二号断裂带为研究对象，综合断裂动力学特征、运动学特征、几何学特征等研究，将中段“坡坪式”断裂体系、两侧“铲式”断裂体系等差异性断裂体系内部划分为3级雁列式主断裂、4级分支断裂、5级分支断裂。中段“坡坪式”断裂体系受到更高强度地应力作用，主断裂与分支断裂更为发育，二号断裂带绝大多数油气分布于此。综合分析二号断裂带差异性断裂体系内部断裂系统与油气展布规律之间的关系，得到3方面断裂控藏规律及4种优势断裂控藏模式。在断裂控藏规律及断裂控藏模式的指导下，搜索、优选二号断裂带中段北1块、北3块、北4块潜力目标进行评价、实施。3个潜力区块均实施成功，达到地质油藏目的，断裂控藏规律、断裂控藏模式在涠西南凹陷二号断裂带潜力区块应用效果好。Abstract: The Weixi’nan Sag is the important research area of exploration and development integration. This study takes the Weizhou Formation of the No.2 Fracture Zone as the research object. By analyzing the geometry, kinematics, and dynamics characteristics of fracture, the "slope-flat" fault system in the middle section and the "shovel-type" fault system on both sides are divided into the level 3 en-echelon main fracture zone, the level 4 branch fracture zone, and the level 5 branch fracture zone. The "slope-flat" fault system in the middle section is subjected to higher in-situ stress, and the main and branch faults are more developed. The vast majority of oil and gas are distributed in the "slope-flat" fault system. A comprehensive analysis of the relationship between the internal fracture system of the differential fault system in the No.2 Fracture Zone and the oil-gas distribution law is made, and obtains the corresponding regular of 3 aspects of fracture reservoir controlling mechanism and 8 types of fracture reservoir controlling patterns. Under the regular of fracture reservoir controlling mechanism and patterns, the search and evaluation of targets are carried out around the inner or surrounding oil fields of the No.2 Fracture Zone, and good results are obtained. Based on the field production, the potential targets of North 1, North 3 and North 4 in the middle part of the No.2 Fracture Zone are searched and optimized. The three blocks have been successfully drilled, and the purpose of the geological reservoir has been achieved. The regular of fracture reservoir controlling mechanism and patterns which have been applied to the potential zone of the No.2 Fracture Zone in the southwest depression play very good effect.
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图 1 涠西南凹陷区域构造及油田分布
Fig. 1 Regional structurae and distribution of oil field in the Weixi’nan Sag
图 3 南海及围区地幔流应力场
Fig. 3 The mural flow stress field in the South China Sea and surrounding areas
图 6 二号断裂带主断裂垂直断距、水平断距统计
Fig. 6 The main fracture vertical and plane fault distance of No.2 Fracture Zone
图 7 二号断裂带主断裂、分支断裂剖面形态
Fig. 7 The main fracture, branch fracture section morphology of No.2 Fracture Zone
图 8 二号断裂带分支断裂断层倾角统计
Fig. 8 The branch fracture fault inclination of No.2 Fracture Zone
图 9 二号断裂带分支断裂垂直断距、水平断距统计
Fig. 9 The branch fracture vertical and plane fault distance of No.2 Fracture Zone
图 10 二号断裂带涠洲组断裂系统划分
Fig. 10 The fracture system classification of Weizhou Formation, No.2 Fracture Zone
图 11 二号断裂带两侧J油田、中段E油田油藏展布统计
Fig. 11 The reservoir distribution of the J oil field in side and the E oil field in the middle of No.2 Fracture Zone
图 12 二号断裂带断裂发育特征与油气分布
Fig. 12 The fracture developmental characteristics and reservoir distribution of the No.2 Fracture Zone
图 15 涠西南凹陷二号断裂带涠洲组已钻圈闭断层侧向封堵性与含油气性SGR-SSF判别图版
Fig. 15 The SGR-SSF chart of the crossrange fault sealing and oil-bearing of reservoir traps in the Weizhou Formation of No.2 Fracture Zone, Weixi’nan Sag
图 16 二号断裂带涠洲组已成藏圈闭运移断裂模式
Fig. 16 The migration fracture model of the the hydrocarbon traps for Weizhou Formation，No.2 Fracture Zone
图 17 二号断裂带涠洲组不同断裂组合运移断裂模式
Fig. 17 The migration fracture model of the different fracture combination for Weizhou Formation, No.2 Fracture Zone
图 18 二号断裂带涠洲组不同断裂组合遮挡断裂模式
Fig. 18 The sealing fracture model of the different fracture combination for Weizhou Formation, No.2 Fracture Zone
图 19 二号断裂带断裂控藏模式
Fig. 19 The fracture reservoir controlling model of No.2 Fracture Zone
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