塔里木盆地迪那2气田古近系离散裂缝表征与建模  

Discrete fracture characterization and modeling of Paleogene in Dina-2 gas field,Tarim Basin

作　　者：陈袁 廖发明 吕波 贾伟 宋秋强 吴燕 亢鞠 鲜让之 CHEN Yuan;LIAO Faming;LYU Bo;JIAWei;SONG Qiuqiang;WU Yan;KANG Ju;XIAN Rangzhi(Dina Oil and Gas Development Department,PetroChina Tarim Oilfield Company,Korla 841000,Xinjiang,China;Supervision Center,PetroChina Tarim Oilfield Company,Korla 841000,Xinjiang,China)

机构地区：[1]中国石油塔里木油田分公司迪那油气开发部,新疆库尔勒841000 [2]中国石油塔里木油田分公司监督中心,新疆库尔勒841000

出　　处：《岩性油气藏》2022年第3期104-116,共13页Lithologic Reservoirs

基　　金：中国石油科技重大专项“库车坳陷深层—超深层天然气开发关键技术研究与应用”(编号:2018E-1803)资助。

摘　　要：通过岩心分析、成像测井、地球物理、储层地质、油藏动态等资料,对塔里木盆地迪那2气田古近系裂缝进行了研究。利用构造光滑、三维边界探测和边界加强等联合技术识别不同尺度的裂缝分布,采用分级次的裂缝建模技术建立裂缝分布的三维地质模型。研究结果表明:(1)迪那地区古近系裂缝走向以近东西向的高角度斜交缝和垂直缝为主,宏观裂缝真开度普遍小于0.460 mm,线密度均值为0.730条/m,充填程度较高;微观裂缝真开度小于0.037 mm,面密度均值为0.031条/m2,充填程度低,裂缝多为与构造变形及断裂作用相关的剪裂缝。(2)三维最小曲率地震属性对断层和裂缝响应敏感。联合边界探测处理及三维边界增强等技术识别的蚂蚁体在断层和裂缝的识别度方面明显提高。沉积储层及生产动态特征可用于预测井间小尺度裂缝的分布。(3)储层模拟采用相控条件下的序贯高斯随机模拟,模拟前后孔隙度和渗透率数据基本保持一致,计算模型地质储量较真实储量误差小,地质模型整体上能客观反映气藏地质特征。(4)将研究区的4组裂缝的不同属性体做权重分析,利用不同权重系数对属性体进行融合建立裂缝密度属性场,最后通过优选裂缝建模方法,对不同裂缝组设置相应的模型参数,完成离散裂缝三维地质建模,通过动态验证地层系数总体误差小于5%。Based on the data of core analysis,imaging logging,geophysics,reservoir geology and reservoir performance,the basic parameters of fractures of Paleogene in Dina-2 gas field of Tarim Basin were described. The joint technologies such as structural smoothing,three-dimensional boundary detecting and boundary strengthening were used to identify the multi-scale fracture distribution,and then a three-dimensional geological model of fracture distribution was established by using multi-scale fracture modeling technology. The results show that:(1)The Paleogene fractures in Dina area are mainly high angle oblique fractures and vertical fractures in near EW direction. The true opening of macro fractures is generally less than 0.460 mm,the average linear density is0.730 pieces per meter,the filling degree is high. The true opening of micro fractures is less than 0.037 mm,the average surface density is 0.031 pieces per square meter,and the filling degree is low. Most of the fractures are shear fractures related to structural deformation and faulting.(2)The three-dimensional minimum curvature seismic attribute is sensitive to faults and fractures. The ant-tracking attribute volumes identified by boundary detecting and three-dimensional boundary strengthening technology has significantly improved the recognition degree of faults and fractures. The sedimentary reservoir and production performance characteristics can be used to predict the distribution of small-scale fractures between wells.(3)The sequential Gaussian random simulation under facies-controlled conditions was adopted for reservoir simulation. The porosity and permeability before and after simulation are basically consistent. The error between the calculated geological reserves and real reserves is small. On the whole,the geological model can objectively reflect the underground geological characteristics of gas reservoir.(4)The weights were analyzed with different attribute volumes of the four groups of fractures in the study area. The attribute volumes were fused wit

关 键 词：动态优化 裂缝建模 地质建模 裂缝描述 古近系 迪那2气田 塔里木盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P631.4[天文地球—地质矿产勘探]