孔洞缝白云岩储层连通性评价方法研究及应用  

Research on connectivity evaluation methods and application for dolomite reservoir with fracture-cave

作　　者：苏云河[1] 李熙喆[1] 万玉金[1] 张林[1] 刘晓华[1] 刘华林[1] Su Yun-he Li Xi-zhe Wan Yu-jin Zhang Lin Liu Xiao-hua Liu Hua-lin(PetroChina Petroleum Exploration and Development Research Institute ,Langfang 065007 ,Chin)

机构地区：[1]中国石油勘探开发研究院,河北廊坊065007

出　　处：《天然气地球科学》2017年第8期1219-1225,共7页Natural Gas Geoscience

基　　金：中国石油股份公司深层油气重大专项"深层油气藏开发关键技术"(编号:2014E-3203)资助

摘　　要：四川盆地磨溪区块龙王庙组储层为一套发育孔、洞、缝3种储集空间的白云岩储层。孔、洞、缝配置的多样性,造成不同滩体部位的储层物性及产能差异大,储层非均质性强,连通性评价难度大。针对这类储层的特点建立了动态、静态相结合的气井连通性评价方法,首先用静态分析法(地质特征、原始地层压力和流体性质对比分析方法)初步评价气藏(井)的连通性,再用动态分析法(试井、类干扰试井和生产动态分析法)进一步评价气藏(井)的连通性。最后,基于连通气井达到拟稳态渗流后,气井的配产与井控动储量成正比的渗流理论,结合动静态分析法的结果综合评价气藏(井)的连通性。通过该方法评价磨溪9井组的连通性,认识到该井组处于滩体的主体部位,气藏性质相同,新投产的井地层压力均下降,试井曲线无明显边界特征,生产动态曲线出现井间干扰现象及气井的配产与井控动储量成正比,证明气藏(井)的连通性好。由于磨溪009-X6井投产时的地层压力高于同一时间相距1.5km的磨溪009-X1井的地层压力,进一步说明该气藏(井)连通具有方向性。Natural gas was found mainly stored in corroded pores and caves in the Lower Cambrian Longwangmiao Formation dolomite gas reservoirs in the Moxi block of Sichuan Basin.Because of the diversity of combination of pores and holes and fractures, different reservoir physical property and different gas well deliverability are found in different position of the grain beach with strong heterogeneity.So,it is difficult for the connectivity evaluation on this. Based on the reservoir characteristics, the combination of dynamic and static analysis method of gas well connectivity was built.Firstly,based on static data,comparative anal- ysis methods of geological characteristics, formation pressure, and fluid property are used to evaluate gas reservoir （well） connectivity.Secondly,based on dynamic data,comparative analysis methods are used to e- valuate gas reservoir （well） connectivity, which include pressure build-up test, pseudo-interference well test,and production performance analysis. Finally, based on pseudo-steady seepage theory, i. e. gas rate is proportional to the dynamic reserve controlled by the well.Gas well connectivity was comprehensively evaluated by the combination of dynamic and static analysis method. In a case study from the well block of Moxi 9,gas reservoir （well） connectivity is good in the main body of grain beach. For example,the fluid property is similar for all wells, and the formational pressures synchronously decline between new wells and old wells.No boundary features are found in Log well test curves,and inter-well interference phenome- non is found in the curve of normalized rate and metrical balance pseudo time, and gas rate is proportional to the dynamic reserve controlled by the well.When Well Moxi 009-X6 was put into production,its formation pressure was higher than that of Well Moxi 009-X1 at the same time, which is 1.5 kilometers away from Well Moxi 009-X6.Further,it is not connected to all but a certain direction.

关 键 词：白云岩储层 连通性 动静态分析法 磨溪龙王庙气藏 

分 类 号：TE122.1[石油与天然气工程—油气勘探]