涪陵页岩气田焦石坝区块页岩脆性指数地震定量预测

发布时间：2018-02-24 11:02

本文关键词： 四川盆地涪陵页岩气田晚奥陶世早志留世应力环境剪切模量脆性指数地震定量预测有利层段　出处：《天然气工业》2017年07期 　论文类型：期刊论文

【摘要】：为了确定四川盆地涪陵页岩气田焦石坝地区页岩储层相对高脆性层段及压裂有利区,研发了适应于复杂构造应力环境的多参量页岩脆性指数的地震定量预测技术。首先通过对构造、岩石矿物组分、岩心裂缝发育程度、测井、地震等资料的综合分析,明确了构造挤压应力对岩石脆性特征的影响作用;然后在Rickman公式的基础上,引入反映横向剪切应力—应变作用的剪切模量,构建了基于杨氏模量、泊松比、剪切模量×密度的新脆性指数预测模型;最后结合基于矿物组分的弹性岩矿脆性指数法可精确计算全井段脆性指数的优势,形成了适应复杂构造应力环境的多参量页岩脆性指数定量预测技术。应用效果表明:(1)利用该技术预测的结果与未参与建模探井的脆性指数计算结果吻合较好,相对误差在4%以内,证明该技术是可靠的;(2)焦石坝地区上奥陶统五峰组—下志留统龙马溪组优质页岩的脆性指数具有自上而下逐渐增高的趋势且横向上分布稳定,其中五峰组—龙马溪组一段一亚段的脆性指数为最高,是水平井穿行与压裂的最有利层段。
[Abstract]:In order to determine the Sichuan basin, Fuling shale gas coke dam area of shale reservoir with relatively high brittleness layer and fracturing favorable area, developed suitable for complicated tectonic stress environment multi parameter quantitative seismic prediction technology. The shale brittleness index based on structure, rock mineral composition, rock fracture development, logging, comprehensive analysis seismic data, the tectonic stress influence on rock brittleness effect; then based on the Rickman formula, which can reflect the transverse shear shear modulus stress-strain function, constructed based on Young's modulus, Poisson's ratio, a new prediction model of brittleness index of shear modulus and density; finally, based on the elastic rock brittleness index method of mineral components can be precisely all the wells brittleness index computing, forming a complex structure should adapt to the multi parameter shale brittleness index quantitative prediction of environmental stress Technology. The application results show that: (1) the predicted results and the brittleness index did not participate in the modeling wells calculation results are in good agreement with the relative error is less than 4%, proved that the technology is reliable; (2) coke dam area of Upper Ordovician five peak - Lower Silurian Longmaxi shale brittleness index has increased gradually from top to bottom and lateral distribution is stable, of which five peak brittleness index group - Longmaxi period of a sub section of the highest level is well through the most favorable reservoir and fracturing.

【作者单位】：中国石油化工股份有限公司勘探分公司;
【基金】：国家科技重大专项“页岩气区带目标评价与勘探技术”(编号:2017ZX05036) 中石化科技部基础研究项目“川渝地区海相优质页岩气层形成主控因素及预测技术”(编号:P15074)
【分类号】：TE311

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