火成岩复杂岩性潜山“相控”裂缝建模及质控方法——以惠州26-6油田潜山油气藏为例  

Lithofacies-controlled Fracture Modeling and Quality Control Methods for Complex Lithology Igneous Buried Hill Rrservior:Taking Igneous Buried Hill Rrservior of Huizhou 26-6 Oilfield as an Example

作　　者：邓永辉 王华 衡立群 杨娇 陈斯宇 DENG Yong-hui;WANG Hua;HENG Li-qun;YANG Jiao;CHEN Si-yu(CNOOC China Ltd.Shenzhen Co.,Shenzhen 518054,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,深圳518054

出　　处：《科学技术与工程》2023年第18期7671-7677,共7页Science Technology and Engineering

基　　金：中国海洋石油集团有限公司“十四五”重大科技项目(KJGG2022-0702)。

摘　　要：珠江口盆地惠州26-6油田火成岩潜山岩性复杂,裂缝发育,储层非均质性强,常规单一地震裂缝预测技术无法精细刻画裂缝分布规律,因此提出一套基于地质主控因素定量表征约束下的“相控”裂缝建模技术及其质控方法。首先利用钻井及地震资料精细刻画主要岩性体空间分布,并建立火成岩岩性模型;其次,采用裂缝发育主控因素定量表征方法,预测不同成因裂缝井间分布规律,建立不同成因裂缝发育密度概率体;在此基础上,以井点裂缝密度作为硬数据,以裂缝发育密度概率体为约束条件,采用随机模拟方法建立裂缝密度模型;最后,以裂缝密度模型及井点统计裂缝参数为输入信息,在岩性模型控制下通过地质统计学方法建立离散裂缝网络模型,并运用petrel软件中的Oda算法将其等效为裂缝属性模型。采用动静态结合的方法对裂缝模型进行质控优选,得到符合地质、油藏认识的裂缝属性模型。该模型较好地表征了潜山不同部位、不同岩性储层裂缝的发育特征,可有效指导油气田开发方案的编制。The igneous buried hill of Huizhou 26-6 Oilfield in Pearl River Mouth Basin has complex lithology,developes fractures and the reservoir is highly heterogeneous,the conventional single seismic fracture prediction technique can not finely characterize the distribution of fractures.A fracture modeling method based on strictly controlled by lithology and major controlling factors was presented in this article.Firstly,the spatial distribution of main lithologic bodies of the igneous buried hill was described by drilling and seismic data,and the the lithology model of igneous rock was also established.Secondly,the probability trend bodies of fracture density for different genetic types of fractures were built by the quantitative characterization of geological main control factors under lithofacies constraints was established by quantitative characterization method of geological main control factors.On this basis,taking the fracture density at the well point as the prior information,and the probability trend bodies of fracture density as the constraint condition,the fracture density model was established by stochastic simulation method.Then,using the fracture density model and well point statistical fracture parameters as input information,the discrete fracture network model was established by geostatistical method.Finally,the discrete fracture network model was equivalented to the fracture property model by Oda algorithm in Petrel software.In the modeling process,both the dynamic and static methods were used to optimize the quality control of the fracture model,to ensure that the result accords with the understanding of geological features of reservoirs.The final model can well characterize the fracture development characteristics of different lithologic reservoirs in different parts of buried hill,and can effectively guide the preparation of oil and gas field development plan.

关 键 词：珠江口盆地 惠州油田 火成岩潜山 相控 裂缝建模 模型质控 

分 类 号：P618.13[天文地球—矿床学] TE122[天文地球—地质学]