多尺度多元约束的断控岩溶储集体建模  

Multi⁃Scale and Multi⁃Constraint Geological Modeling of Fault⁃Controlled Karst Reservoirs

作　　者：李吉康 曾清勇 郭臣[1] 李青[1] 朱乐乐 LI Jikang;ZENG Qingyong;GUO Chen;LI Qing;ZHU Lele(Research Institute of Exploration and Development,Northwest Oilfield Company,Sinopec,Urumqi,Xinjiang 830011,China)

机构地区：[1]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011

出　　处：《新疆石油地质》2024年第6期719-724,共6页Xinjiang Petroleum Geology

基　　金：中国石化科研攻关项目(P24161)。

摘　　要：断控岩溶缝洞型油藏断裂系统发育,储集空间复杂,离散性和非均质性极强,油藏断裂系统建模困难。以断控岩溶储集体发育成因规律为指导,提出多尺度、多元约束相结合的方法建立断控岩溶储集体模型。依据断控岩溶成因,将储集体发育划分为4个阶段,以成熟阶段的储集体模式为指导,将断控岩溶储集体划分为溶洞相、溶蚀孔洞相和溶蚀裂缝相;采用蚂蚁体重采样、断距模型和裂缝参数表征的多元约束,建立裂缝发育概率体,采用基于目标的模拟算法,生成北西—南东向和北东—南西向2组小尺度裂缝,建立断控岩溶的裂缝模型,最大程度上体现断控岩溶裂缝发育特征,降低裂缝预测的不确定性,形成断控岩溶储集体预测新方法;2口井验证模型可靠性强,可支持后续开发研究。Fault⁃controlled karst fractured⁃vuggy reservoirs that are characterized by well⁃developed fault systems exhibit complex reservoir spaces with significant discreteness and heterogeneity,posing great challenges to fault system modeling and description.Guided by the developmental and genetic patterns of fault⁃controlled karst reservoirs,a multi⁃scale and multi⁃constraint geological model of fault⁃controlled karst reservoir was established.Depending on the genesis of fault⁃controlled karst,the development of these reservoirs was divided into four stages(Ⅰ-Ⅳ).Based on the reservoir model of StageⅣ,the fault⁃controlled karst reservoirs were divided into karst cave facies,dissolution pore facies,and dissolution fracture facies.A fracture development probability cube was constructed with multiple constraints which include ant weight sampling,fault displacement model,and fracture parameter characterization,and two groups of small⁃scale fractures of NW-SE and NE-SW trending were generated by applying a goal⁃oriented simulation algorithm.A fracture model of fault⁃controlled karst was established to reflect the development characteristics of the fractures in fault⁃controlled karst to the greatest extent,for reducing the uncertainty in fracture prediction.Thus,a new method for predicting fractures in fault⁃controlled karst reservoirs was formed.The reliability of the proposed model has been validated by the application in two wells,which may support subsequent development research.

关 键 词：塔河油田 碳酸盐岩 缝洞型油藏 断控岩溶 地质建模 裂缝表征 

分 类 号：P618.13[天文地球—矿床学]