板桥区块长兴组不同储层类型及其勘探潜力评价

Evaluation of Exploration Potential of Diff erent Reservoir Types of Changxing Formation in Banqiao Block

本文利用岩心、薄片、测井等资料按照不同的分类方法对板桥区块长兴组储层类型进行了划分。按照是否有造礁生物,划分为生物礁储层和生屑滩储层;按照起主导作用的储集空间类型划分为裂缝-孔隙型和孔隙-裂缝型储层。结合不同储层类型典型井的试油及生产情况,分析其勘探潜力,得到以下认识:(1)生物礁储层物性好,储层厚度大,累产气量大,含气性比生屑滩储层更好,勘探潜力更大。生屑滩储层孔隙度普遍较低,只有在裂缝较发育时,可获得较大的勘探潜力。(2)裂缝-孔隙型储层的含气性比孔隙-裂缝型储层更好,勘探潜力更大,即使测试产量不高,但累产气量大,生产效果好;而孔隙-裂缝型储层由于孔隙度低,储层致密,即使初始测试产量较高,但稳产能力不足,后期生产效果不好。

This article uses core,thin section,logging and other data to classify the reservoir types of the Changxing Formation in the Banqiao block according to different classification methods.According to whether there are reef building organisms,it is divided into biogenic reef reservoirs and biogenic debris beach reservoirs;According to the dominant type of reservoir space,it can be divided into fracture pore type and pore fracture type reservoirs.Based on the oil testing and production situation of typical wells of different reservoir types,the exploration potential is analyzed,and the following understanding is obtained:(1)Biological reef reservoirs have good physical properties,large reservoir thickness,high cumulative gas production,better gas content than bioclastic beach reservoirs,and greater exploration potential.The porosity of the bioclastic beach reservoir is generally low,and only when the fractures are well-developed,can significant exploration potential be obtained.(2)The gas content of fractured porous reservoirs is better than that of porous fractured reservoirs,with greater exploration potential.Even if the test yield is not high,the cumulative gas production is large and the production effect is good;However,porous fractured reservoirs have low porosity and tight reservoirs.Even if the initial test yield is high,the stable production capacity is insufficient,and the later production effect is not good.