大牛地气田马五_(1-2)致密碳酸盐岩储层平缓构造带裂缝预测  

Fracture prediction of the Ma5_(1-2) tight carbonate reservoir in gentle structure zone,Daniudi gas field

作　　者：张冲[1] 周文[1,2] 谢润成[1,2] 朱涛[1] 杨秀堃 

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [3]中法渤海地质服务有限公司,广东湛江504057

出　　处：《东北石油大学学报》2014年第3期9-17,5-6,共9页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2008ZX05002);国家自然科学基金项目(41202096)

摘　　要：大牛地气田处于鄂尔多斯盆地平缓构造带.为了有效预测大牛地气田马五1-2储层致密碳酸盐岩储层裂缝发育规律,根据岩心观察、薄片裂缝特征鉴定,确定裂缝主要为压剪应力环境下形成的构造剪切缝和扩张破裂缝,有效性较高.结合岩石声发射实验曲线和碳氧同位素分析结果,马五1-2储层裂缝形成期为3期,应力环境在61.37～120.75MPa之间.参照岩石力学测试结果和岩石应力应变关系,选用非线性弹塑性力学模型对大牛地气田马五1-2储层顶部构造进行应力模拟裂缝预测.结果表明：应力模拟结果与声发射反映的应力环境相同,高值应力区（大于70 MPa）主要集中在大牛地气田鼻隆构造带和变形较强的交汇区,这些地区岩心裂缝密度较大,应力与产能相关因数达到0.8以上,高值应力对产能控制作用明显.确定构造应力大于80 MPa为裂缝发育区,60～80 MPa为裂缝较发育区,低于60 MPa为裂缝不发育区.应力模拟裂缝预测模型可靠,预测结果可为大牛地气田马五1-2储层的后续开发评价和其他构造平缓带碳酸盐岩储层裂缝预测提供依据.Daniudi gas field is located in ordos basin where there is gentle structure zone.To predict the fracture development regularity of the tight carbonate reservoir in Ma51-2member,the core observation,thin section fracture identification determine the fracture is formed in pressure shear stress environment,and its effective level is high.Acoustic emission test curve and carbon and oxygen isotope analysis reflect three formation stage of fracture and the stress environment between 61.37 MPa and 120.75 MPa.According to the results of rock mechanics test and rock stress strain relationship,we select the nonlinear flexible finite element methods to predict fracture.The results show the stress simulation is the same as the stress environment that acoustic emission reflects.The high value area of stress is mainly concentrated in nose structure belt and the tectonic belt with strong deformation of Daniudi gas field,where the core fracture density is bigger;stress and the production capacity correlation coefficient is above 0.8.The high value area of stress has strong control over the production capacity.Finally,it ensures the stress of fracture developed area is above 80 MPa.The development of secondary fracture developed area is between 60 MPa and 80 MPa,and where the stress below 60 MPa is non development area of fracture.The prediction results can provide the reasonable geological reference for the following development evaluation and the fracture prediction of carbonate rock reservoir in other gentle structure zone.

关 键 词：非线性弹塑性模型 平缓构造带 裂缝预测 声发射 裂缝期次 大牛地气田 马五1-2 

分 类 号：TE121.2[石油与天然气工程—油气勘探]