摘要
针对构造裂缝发育的复杂性及展布的不均一性,以中国东部渤海湾盆地东营凹陷博兴洼陷沙三中亚段致密砂岩储层为例,在裂缝发育地质模式指导下,基于岩石力学测试,采用随机建模与构造应力场数值模拟方法,综合岩相、构造部位和应力对裂缝空间发育进行定量化预测,以离散裂缝网络建模方法建立裂缝模型,并通过生产动态数据验证模型准确性。结果表明:以细砂岩和粉砂岩为主的水道前缘砂坝和朵叶体微相中,颗粒粒度小、孔隙度低、脆性高,裂缝较为发育;在内扇,以中粗砂岩和砂砾岩为主的辫状水道微相中,颗粒粒度大、孔隙度高、脆性低,裂缝不易发育;在断层上盘、高隆起、断层尖端、拐点部位,应力较为集中,裂缝发育;在断层下盘、远离断层、低隆起、地势平坦部位,应力分散,裂缝不易发育。
Considering the complexity of fracture development and the heterogeneity of distribution laws, the third member of the Paleogene Shahejie Formation tight sandstone was studied in eastern China. Guided by the geological model of fault-related fracture and based on the rock mechanics tests, the spatial distribution of fractures is quantitatively predicted. Stochastic modeling and numerical simulation of tectonic stress field are used to synthesize lithofacies, structure and stress. Discrete fracture network method is used to establish the fracture model, which is verified by production data. The modeling results show that the channel leading sand dams and lobes are dominated by fine sandstone and siltstone, with small grain size, low porosity, high brittleness, and well developed fractures. The channel of inner fan is dominated by middle coarse sandstone and sand conglomerate, with grain size, high porosity, low brittleness, and under-developed fractures. On the hanging wall and at locations of high uplift, fault tip and inflection point, the stress is concentrated and the fracture tends to develop. On the footwall and at locations far from the fault, low uplift and flat terrain, the stress is dispersed and the fracture is less easy to develop.
作者
林承焰
李辉
马存飞
任丽华
陈仕臻
李师涛
梁书义
LIN Chengyan;LI Hui;MA Cunfei;REN Lihua;CHEN Shizhen;LI Shitao;LIANG Shuyi(School of Geosciences in China University of Petroleum (East China), Qingdao 266580, China;Reservoir Geology Key Laboratory of Shandong Province, Qingdao 266580, China;Key Laboratory of Deep Oil and Gas in China University of Petroleum (East China), Qingdao 266580, China;Dongsheng Petroleum Development Group Company Limited of Shengli Oilfield, Dongying 257000, China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第5期21-33,共13页
Journal of China University of Petroleum(Edition of Natural Science)
基金
“十三五”国家科技重大专项(2017ZX05009001,2017ZX05072)
中央高校基本科研业务费专项(18CX02178A)
关键词
构造裂缝
致密砂岩
应力场模拟
离散裂缝网络
密度体
岩石力学
tectonic fracture
tight sandstone
tectonic stress field simulation
discrete fracture network
density model
rock mechanics
