苏49-01加密区有效储层分布预测及开发井距优化分析

Prediction of Effective Reservoirs Distribution and Optimization Analysis of Development Well Spacing in Su49-01 Infilling Experimental Area

苏里格气田苏49-01加密实验区上古生界二叠系下石盒子组的盒8段及山西组的山1段为河流相沉积,有效储层几何形态、规模大小、井间连通性、垂向叠置关系及物性条件认识难度大,单井控制储量和产量低。综合运用地质、测井及地震资料,以沉积学、地球物理学以及地质统计学为指导,运用测井约束反演方法开展了有效储层横向预测研究,解决了有效储层空间分布及连通性等问题。同时,在有效储层预测结果基础之上,讨论了5种矩形井网对有效储层的控制程度,综合分析了研究区合理的开发井距。分析表明：研究区目的层砂体数目多,规模小,宽度多为400-600m,单砂体有效厚度多为3-6m,有效砂砂体连通性较差;合理开发井网井距600-800m之间,结合有效砂体的分布情况,应采用不规则井网部署开发。该研究结果对油田下一步井网部署及调整具有一定参考意义。

He8 member of Xiashihezi Formation and Shan1 member of Shanxi Formation of Permian in Upper Paleozoic in Su49-01 infilling experimental area of Sulige gas field were fluvial facies.The shape,scale,connectivity,vertical-overlay relation and physical properties of effective reservoirs are hard to know clearly,and single well controlled reserves and production is low.Horizontal prediction of the effective reservoirs was stud-ied by logging constrained inversion method in order to figure out the space distribution and connectivity of the effective reservoirs under the guide of geology,well log,seismic data,sedimentology,geophysics and geostatistics.Based on the prediction results of the effective reservoirs,control degree of 5 rectangular well patterns on the effective reservoirs was discussed,and proper well spacing in the study area was analyzed comprehensively.The results show that there are lots of sandbodies with small scale,400-600 m of width,almost3-6m of effective thickness of each and poor connectivity of the effective one in the target zone of the study area.Reasonable well spacing is between 600 and 800 m.Irregular well pattern should be applied for de-velopment under the guide of distribution of the effective sandbodies.The result could be the reference for the next deployment and adjustment of well pattern of the oilfield.