玛北地区砂砾岩储层地应力方向测井识别及主控因素

doi:10.11743/ogg20150410

Abstract

Abstract:

One of the challenges the operators have been facing in fracturing the tight coarse-grained clastic reservoirs in Mabei area of Juggar basin is to identify the orientation of present stress field.This has made the characterization of present stress filed orientation and its controlling factors more significant than before.The paper introduces an identification method of the orientation through 1) recognizing of well axis by locating the polar plate of dipmeter and reading micro resistivity image abnormal(the orientation of the long axis represents the direction of the minimum principle stress, which can be used to roughly indicate the orientation of in-situ stress field); 2) determining the orientation of induced fracture in the wall of boreholes by FMI firstly and then identifying the in-situ stress orientation; or 3) using dipole shear imaging log with fast-slow shear velocity and orientation pickup first and then identifying the orientation.Analyses of plane distribution and main controlling factors of stress field in the study area based on the identification shows that the present maximum horizontal principle stress in Mabei is overall in an E-W direction.The present maximum horizontal principle stress field orientations were mainly controlled by the paleotectonic movement.Faulting activities in some part of the region exerted influences over changing of the orientation of the present stress field.The extent of the change is thought to be linked to faulting features and scale.

Key words: stress orientation, logging identification, coarse-grained clastic reservoir, Mabei area, Juggar Basin

CLC Number:

TE122.1

Fu Jianwei, Li Hongnan, Sun Zhongchun, Wang Guiwen, Luo Xingping. Logging identification and controlling factors of present stress orientations of the coarse-grained clastic reservoirs in Mabei region, Juggar Basin[J]. Oil & Gas Geology, 2015, 36(4): 605-611.

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Logging identification and controlling factors of present stress orientations of the coarse-grained clastic reservoirs in Mabei region, Juggar Basin

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