张冲;周文;谢润成;朱涛;杨秀堃;

• 1:成都理工大学能源学院

• 2:成都理工大学油气藏地质及开发工程国家重点实验室

• 3:中法渤海地质服务有限公司

摘要(Abstract)：

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70MPa)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80MPa为裂缝发育区,60~80MPa为裂缝较发育区,低于60MPa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.

关键词(KeyWords)：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

Abstract:

Keywords:

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

作者(Author):张冲;周文;谢润成;朱涛;杨秀堃;

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