东方A气田海底扇非均质性储层精细刻画研究
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摘要
莺歌海盆地东方A气田为"十二五"期间发现的高温高压气藏,属于浅海背景海底扇沉积,砂体叠置关系复杂,储层非均质性强,地质风险大。利用高密度三维地震资料,采用相位转换、分频解释等技术,对储层砂体进行了精细刻画;通过正演模拟和反演验证,分析了储层的内部结构及叠置连通关系。目的层中新统黄流组一段的2套主要含气砂体中,H_1Ⅰ_a砂体平面可识别出13个单砂体,部分单砂体呈叠置连通关系;H_1Ⅱ_b砂体纵向上可划分为上下2套砂体,中间隔夹层发育。基于砂体精细刻画结果,规避储层不连续及开发井见水风险,优化开发井的井位和井型,提升了钻井成功率。
Dongfang A gas field in Yinggehai Basin is a high temperature and high pressure gas reservoir discovered during the 12 th Five-Year Plan period. It belongs to the submarine fan deposit with shallow sea background, with the characteristics of complex sand body superimposition, strong reservoir heterogeneity, and high geological risk. Based on high-density three-dimensional seismic data, the reservoir sand body is delicately characterized by phase conversion and frequency division interpretation techniques. Through forward simulation and inversion verification, the internal structure of the reservoir and the superimposed connection relationship are analyzed. Among the two sets of main gas-bearing sand bodies in the first member of the Miocene Huangliu Formation, 13 single sand bodies can be identified in the plane of H_1I_a sand body, some of which are overlapped and connected; and H_1Ⅱ_b sand body can be divided into two sets of upper and lower sand bodies vertically, with interlayer developed. Based on the results of fine sand body characterization, the risk of discontinuity of reservoir and water breakthrough of development wells is avoided, and the well location and well type of development wells are optimized, thus enhancing the success rate of drilling.
Dongfang A gas field in Yinggehai Basin is a high temperature and high pressure gas reservoir discovered during the 12 th Five-Year Plan period. It belongs to the submarine fan deposit with shallow sea background, with the characteristics of complex sand body superimposition, strong reservoir heterogeneity, and high geological risk. Based on high-density three-dimensional seismic data, the reservoir sand body is delicately characterized by phase conversion and frequency division interpretation techniques. Through forward simulation and inversion verification, the internal structure of the reservoir and the superimposed connection relationship are analyzed. Among the two sets of main gas-bearing sand bodies in the first member of the Miocene Huangliu Formation, 13 single sand bodies can be identified in the plane of H_1I_a sand body, some of which are overlapped and connected; and H_1Ⅱ_b sand body can be divided into two sets of upper and lower sand bodies vertically, with interlayer developed. Based on the results of fine sand body characterization, the risk of discontinuity of reservoir and water breakthrough of development wells is avoided, and the well location and well type of development wells are optimized, thus enhancing the success rate of drilling.
引文
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