致密碳酸盐岩气藏井位优选技术及其应用——以苏里格气田东区为例

Research and Application of Well Location Optimization Technique in Tight Carbonatite Gas Reservoir:A Case Study of the Eastern Part of Sulige Gas Field

鄂尔多斯盆地下古生界碳酸盐气藏属于岩性地层圈闭气藏,储层厚度小、非均质性强,开发难度大。为提高气田开发效果,笔者以苏里格气田东区为例,综合应用钻井、测井、地震、试气等动静态资料,通过对沉积相与成岩机理分析、小幅度古构造精细刻画、岩溶古地貌研究,分析白云岩储层的主控因素,明确了天然气高产富集规律及成藏特征,并结合储层地震,综合预测碳酸盐岩致密气藏有利富集区。在综合考虑天然气成藏模式、控制因素及储渗条件等因素的基础上,地质、地震、测井与气藏工程多学科相结合,优选下古气藏井位坐标,形成了适用于苏里格气田东区下古气藏有效开发的井位优选技术。该技术有效提高了下古气藏开发效果,经济效益大,为致密碳酸盐岩气藏高效开发提供了技术指导。

The lower Paleozoic carbonatite gas reservoir in Ordos Basin is litho-stratigraphic trap gas reservoir of small thickness and great heterogeneity,thus difficult to develop effectively.This paper takes the eastern area of Sulige Gas Field as an example,using such dynamic and static data as drilling,well logging,seismic and well test data,etc.to analyze some main controlling factors of dolomite reservoir.It also clarifies the enrichment regularities and the characteristics of hydrocarbon accumulation and makes a synthesis forecast of favorable enrichment areas of tight carbonatite gas reservoir based on the reservoir seismic prediction Taking into considerations of hydrocarbon accumulation,controlling factors and store-permeability conditions,etc.,the authors optimize the well location in the lower Paleozoic carbonatite gas reservoir.This Well Location Optimization technique is applicable to the eastern area of sulige gas field.It has improved the development of the lower Paleozoic carbonatite gas reservoir and provided technical guidance for the efficient development of the tight carbonate gas reservoirs.