泥页岩可压性评价方法及其在焦石坝地区的应用

发布时间：2018-01-16 20:37

本文关键词：泥页岩可压性评价方法及其在焦石坝地区的应用　出处：《地球物理学进展》2016年04期 　论文类型：期刊论文

【摘要】：泥页岩一般具有低孔、低渗的特性,北美页岩气勘探开发经验表明此类页岩储层需经过大规模的压裂改造才能够获得商业产能,因此页岩可压性是评价页岩是否能作为"甜点"的关键指标之一.本文以焦石坝地区志留系龙马溪组-奥陶系五峰组页岩为例,从岩石脆性、地应力特征以及裂缝发育程度三方面评价焦石坝地区的可压性.其中,利用Rickman公式结合叠前地震反演预测证实焦石坝页岩脆性指数较高,构造主体部位脆性指数大于50%,反映页岩易于破裂;页岩岩心实验室测试数据则表明焦石坝地区页岩水平应力差较小(小于0.14),反映页岩在进行工程压裂时易于形成裂缝网络;同时焦石坝地区页岩岩心可见的大量微裂缝,裂缝预测结果也表明构造主体部位网状裂缝发育,更加有利于页岩储层的压裂改造.综合三方面条件来看,焦石坝地区页岩较好的可压性是本区页岩获得商业开发的关键.
[Abstract]:Shale generally has the characteristics of low porosity and low permeability. The experience of shale gas exploration and development in North America shows that this kind of shale reservoir needs large-scale fracturing to obtain commercial production capacity. Therefore, shale compressibility is one of the key indicators to evaluate whether shale can be used as "dessert". This paper takes the Silurian Longmaxi formation-Ordovician Wufeng formation shale as an example from rock brittleness. The compressibility of Jioshiba area is evaluated from three aspects: the characteristics of in-situ stress and the degree of fracture development. Among them, the application of Rickman formula and prediction of pre-stack seismic inversion proves that the brittle index of Jioshiba shale is high. The brittleness index of the main part of the structure is greater than 50, which indicates that shale is prone to fracture. The data of shale core laboratory test show that the horizontal stress difference of shale in Jiaoshiba area is smaller (less than 0.14), which indicates that shale is easy to form fracture network in engineering fracturing. At the same time, a large number of micro-fractures can be seen in the shale core in Jiaoshiba area. The fracture prediction results also show that the network fractures in the main part of the structure are developed, which is more conducive to the fracturing transformation of the shale reservoir. The good compressibility of shale in Jiaoshiba area is the key to the commercial development of shale in this area.
【作者单位】：中国石油化工股份有限公司勘探分公司;
【基金】：中国石油化工股份有限公司科技部项目“四川盆地及周缘区块下组合页岩气形成条件与有利区带评价研究”(P13129)资助
【分类号】：TE311
【正文快照】： 中国石油化工股份有限公司勘探分公司,成都610041SINOPEC exploration company,Chengdu 610041,Chinadoi:10.6038/pg201604090引言四川盆地下志留统龙马溪组展现出巨大的页岩气勘探潜力,近年来在川东南地区不断取得突破(郭旭升等,2012;郭彤楼和刘若冰,2013;郭旭升,2014).焦石

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