楚雄盆地北部T_3-J致密储层裂缝分布规律

DISTRIBUTION LAW OF THE FRACTURES IN COMPACT T_3-J FORMATION IN THE NORTH OF CHUXIONG BASIN

根据野外地面裂缝调查、岩心裂缝观察描述以及测井裂缝识别,指出楚雄盆地北部T3-J致密储层主要是受局部构造控制明显的构造裂缝。结合实验分析结论,指出岩石物性、岩石本身的力学性质、地层中单砂层厚度以及构造变形应力场强度是控制裂缝发育的主要地质因素。根据研究区的实际地质情况,选取了屈曲薄板变形应力场反演和构造变形的主曲率法两种方法来预测裂缝发育带。综合以上两方法,对研究区裂缝相对发育区进行初步评价。

The authors think that the compact reservoir fracture in T3-J Formation in the north of the Chuxiong basin are mainly the tectonic fractures controlled by local structures based on the results of field fracture survey, description of bore core and identification of well logging. Combined with the conclusion of experiments, they point out that the porosity of rocks, dynamic characters, thickness of single sand in strata and distortional stress field intensity are the main geological factors that control the fracture shaped. Grounded on the geological situation, the authors choose the reversal development of stress field and main curvity of structure distortion to predict the structure growing belt, and then, integrate the two methods to evaluate the developing regions of fractures