地质力学学报2012，Vol.18Issue(2)：120-139,20.
川东北宣汉-达县地区构造应力场对裂缝的控制
CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION,NORTHEASTERN SICHUAN BASIN, CHINA
摘要
Abstract
Structural stress field is one of the main reasons on fracture formation. It is the key of prediction structural fracture that paleostructure stress field is microscopically quantitative calculated. So we can well understand the fracture distribution in underground strata based on careful analysis to geological structure and numerical model coincides with the practice about the region of interest. It was influenced due to squeezing process from the SE direction during Late Crataceous and compressed from the NE direction in the period of Late Eocene-Early Oligocene in the Xuanhan-Daxian area of the northeast of Sichuan, China. The structural fracture development in Feixianguan formation in Lower Triassic series was effected by the two periods of structural action in Xuanhan-Daxian region. The fracture is an important geologic factor affecting the development of the oilfield. Through analysis of interaction in rock layers, calculation results on conjugate joints and mechanical twinning and using three dimensional finite element analysis method, we have obtained paleostructure stress in Feixianguan Formation of Xuanhan-Daxian region* We well know the distribution feature of paleostructure stress on the two periods. By threshold value-limited of the carbonatite burst, fracture area in Puguang and Maobawe blocks was predicted prediction. The integrated fracture rates give the basis to evaluate fracture strength. It provides the scientific geological basis for increasing the rate of drilling fractures and reducing the risk and cost of exploration and development.关键词
构造应力场/三维有限元/飞仙关组/构造裂缝/宣汉-达县地区Key words
structural stress fields/ three dimensional finite element/ Feixianguang Formation/ structural fracture/ Xuanhan-Daxian region分类
天文与地球科学引用本文复制引用
唐永,梅廉夫,陈友智,唐文军,肖安成..川东北宣汉-达县地区构造应力场对裂缝的控制[J].地质力学学报,2012,18(2):120-139,20.基金项目
中国地质大学构造与油气资源教育部重点实验室开放研究基金项目(TPR-2011-26) （TPR-2011-26）
