鄂尔多斯盆地气藏新类型储层岩石断裂性质及导流能力  

Breaking Properties and Fracture Conductivity of New Type of Gas Reservoir Rocks in Ordos Basin

作　　者：问晓勇 陈磊[3] 叶亮[1,2] 刘倩[1,2] 冯飞[1,2] 侯瑞[4] 尹太恒[1,2] WEN Xiaoyong;CHEN Lei;YE Liang;LIU Qian;FENG Fei;HOU Rui;YIN Taiheng(National Engineering Laboratory of Low-Permeability Oil&Gas Exploration and Development,Xi’an,Shaanxi 710018,China;Oil and Gas Technology Institute,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710018,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Natural Gas Evaluation Project Department,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710018,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油气工艺研究院,陕西西安710018 [3]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [4]中国石油长庆油田分公司天然气评价项目部,陕西西安710018

出　　处：《西安石油大学学报（自然科学版）》2024年第2期12-21,46,共11页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中国石油天然气股份有限公司重大现场攻关项目“长庆油田5000万吨持续高效稳产关键技术研究与应用”课题6“致密油气提高单井产量及工厂化作业技术研究与试验”(2016E-0506)。

摘　　要：为了明确鄂尔多斯盆地天然气新类型储层矿物特征、断裂性质及导流能力,对陇东铝土岩、太原组灰岩和奥陶系盐下马四白云岩进行了矿物分析、铸体薄片鉴定、宏微观断裂实验和支撑剂嵌入导流能力测试。结果表明:新层系岩石矿物差异明显;断裂韧性高于常规砂岩储层,且铝土岩断裂韧性受水铝石含量影响;新层系岩石微观尺度下断裂韧性低于宏观值;铝土岩和灰岩裂缝扩展过程中易于形成分支缝,白云岩裂缝扩展形态相对简单平直;新层系岩石导流能力随着支撑剂嵌入深度呈二次非线性减小。高应力条件下支撑剂粒径对铝土岩导流能力的影响较小;酸化会弱化马四白云岩力学性质,促使支撑剂由弹性嵌入转化为弹塑性嵌入,进而增大嵌入深度,降低导流能力。The mineral analysis,cast thin section identification,macro and micro fracture experiments,and proppant embedding tests of Longdong bauxite,Taiyuan limestone and Masi dolomite were carried out in order to determine the mineral characteristics,breaking properties and fracture conductivity of new-type gas reservoir rocks in Ordos Basin.The experimental results show that there is obvious difference of minerals in new-type rocks.The fracture toughness of new-type rocks is higher than conventional sandstone reservoirs,and the fracture toughness of bauxite is related to the content of diaspore.The micro fracture toughness of the new-type rocks is lower than their macro fracture toughness.Branch fractures are easily formed in bauxite and limestone,while the fractures in dolomite are relatively straight.The fracture conductivity decreases quadratically with the embedding depth of proppant.The influence of proppant particle size on the fracture conductivity of bauxite is small under high stress condition.Acidification weakens the mechanical properties of Masi dolomite,promoting the transformation of proppant from elastic embedding to elastic-plastic embedding,thereby increasing the embedding depth of proppant and reducing the fracture conductivity of Masi dolomite.

关 键 词：断裂性质 导流能力 新层系 鄂尔多斯盆地 天然气 

分 类 号：TE312[石油与天然气工程—油气田开发工程]