摘要
塔里木盆地顺北地区X区块断控储集体内部结构非常复杂,主要表现为横向非均质性强,断裂分段性、缝洞分割性明显以及储层断裂破碎带内小尺度断裂、缝洞体发育且连通性不明.目前X区块多井出现了产量衰减快、实采储量不及预期的问题.为提高钻井成功率,需要对储层内部结构进行精细描述和连通性量化分析,查清其内部的分割、连通、破碎等情况,以便更精准地指导井位部署和井轨迹设计.以往针对断控储集体内部结构和连通性的地震属性分析多侧重于定性角度,缺少定量表征,尤其在连通性方面仍缺少精确的描述,难以满足储层评价精度的需求.为了实现对缝洞体内部连通性定量刻画,从裂缝构造应力和连通性量化计算原理入手,通过断控缝洞型储层内部断裂、缝洞以及连通性不同目标敏感属性优选、基于多源势场扩散传导的缝洞连通概率分析以及基于多元高斯函数的缝洞体内部总体连通强度量化计算,实现了储层内部结构特征精细描述和连通性量化分析,为X区块勘探目标的优选、井位优化部署等提供了有效的技术支撑.
Abstract
The internal structure of fault controlled reservoirs in X Block,Shunbei area,Tarim Basin is very complex,which is mainly manifested in strong horizontal heterogeneity,obvious fault segmentation,fracture cavity segmentation,and small-scale faults,fracture cavity bodies and unknown connectivity in the reservoir fault fracture zone.At present,many wells in X Block,Shunbei area are experiencing rapid decline of production and actual reserves are lower than expected.In order to improve the rate of success of drilling,it is necessary to finely describe the internal structure of the reservoir and quantitatively analyze its connectivity,clarify its internal segmentation,connectivity,fragmentation,etc.,in order to more accurately guide well location and design of trajectory.In the past,The analysis of seismic attribute of the internal structure and connectivity of fractured reservoirs mainly focused on qualitative analysis,lacking quantitative characterization,especially in terms of connectivity,which still lacks accurate description and cannot meet the demand for continuously improving reservoir evaluation accuracy.In order to achieve quantitative characterization of the internal connectivity of the fracture cavity body,starting from the principles of structural stress of fracture and quantification calculation of connectivity,this study optimized the sensitive attributes of different targets such as fractures,fractures,and connectivity in the fracture controlled fracture cavity type reservoir,analyzed the probability of connectivity of fracture cavity through multi-source potential field diffusion and conduction,and quantitatively calculated the overall connectivity strength of the fracture cavity body using multivariate Gaussian functions.This achieved a detailed description of the internal structural characteristics of the reservoir and quantitative analysis of connectivity,providing effective technical support for the optimization of exploration targets and the deployment of well location in the X Block,Shunbei area.
维普
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