辫状河储层构型表征及对含气饱和度空间分布的控制——以苏里格气田SX密井网区为例  

Configuration characterization of the braided river reservoirs and its controls on the spatial distribution of the gas saturation:Taking SX infill wellblock in Sulige Gas Field as an example

作　　者：段志强[1,2] 李进步[1,2] 白玉奇[1,2] 李浮萍 薛雯[1,2] 孙艳辉[1,2] 李东营[3] DUAN Zhiqiang;LI Jinbu;BAI Yuqi;LI Fuping;XUE Wen;SUN Yanhui;LI Dongying(National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Field, Xi’an 710018, China;Exploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi’an 710018, China;Beijing Grid Earth Technology Ltd, Beijing 100192, China)

机构地区：[1]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [2]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [3]北京网格地球科技有限责任公司,北京100192

出　　处：《大庆石油地质与开发》2020年第5期1-9,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2016ZX05050);中国石油天然气股份公司科技专项“长庆气田稳产及提高采收率技术研究”(2016E-0509)。

摘　　要：辫状河储层是苏里格气田的主要产气储层类型,储层宏观非均质性导致的含气饱和度空间分布规律相关研究较少。为此,以苏里格气田SX密井网区H8X2小层为例,开展了辫状河储层构型表征,结合测井解释成果,分析了储层构型对含气饱和度空间分布影响,并提出了相应的剩余气挖潜措施。结果表明:研究区目的层主要储层构型单元包括心滩和辫状水道;心滩砂体平均长850 m,平均宽380 m;储层构型对含气饱和度分布具有明显的控制作用,5级构型单元整体上约束了含气饱和度的分布,4级构型单元直接控制了有效砂体分布;心滩内部,自迎流面向背流面方向含气饱和度逐渐降低;3级构型单元控制着砂体含气性的垂向分布;区块西侧的1口加密验证井钻探,预测与钻井结果符合程度较高。通过储层构型解剖开展含气饱和度预测准确性较高,研究成果可为井网加密调整提供必要的地质依据。Braided river reservoirs are the main gas-producing reservoirs in Sulige Gas Field, while the relative study on the spatial distribution law of the gas saturation caused by the macro-heterogeneity of the reservoirs is rather poorer. Therefore, taking Sublayer H8X^2 in SX infill well block of Sulige Gas Field as an example, the configuration characterization was conducted for the braided river reservoirs, combining with the logging interpretation results, the influence of the configuration on the spatial distribution of the gas saturation was analyzed,and moreover the corresponding potential-tapping measures were presented. The results show that the configuration units of the main reservoirs for the target layer in the study area are the channel bar and braided channel;the sandbody average length of the former is 850 m and average width is 380 m;the controlling action of the reservoir architecture on the gas saturation distribution is obvious, the fifth-level configuration units constrain the gas saturation distribution as a whole, while the fourth-level configuration units directly control the effective distribution of the sandbody;inside the channel bar, the gas saturation gradually decreases from front to back of the flow surface;the third-level configuration units control the vertical distribution of the sandbody gas-bearing property;one infill-verifying well in the west side of the block was drilled, and its drilling results were in better agreement with ones of the prediction.Through reservoir configuration anatomy proves that the accuracy of the predicted gas saturation is pretty higher,and the study achievements can provide the necessary geological evidences for the infill adjustment of the well pattern.

关 键 词：砂质辫状河 储层构型 心滩砂体 辫状水道 含气饱和度 强非均质性 苏里格气田 

分 类 号：TE122[石油与天然气工程—油气勘探]