MA Ni,
YIN XingYao,
SUN ChengYu et al
.2018.Inversion for crustal stress based on azimuthal seismic data.Chinese Journal Of Geophysics,61(2): 697-706,doi: 10.6038/cjg2018L0183
Inversion for crustal stress based on azimuthal seismic data
MA Ni1,2, YIN XingYao1,2, SUN ChengYu1,2, ZONG ZhaoYun1,2
1. School of Geosciences, China University of Petroleum, Qingdao 266580, China; 2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
Abstract：During exploration and production stages of shale oil and gas, hydraulic fracturing is required to be made on the reservoirs to form cracks which are favorable for hydrocarbon accumulation and migration. As one of the important parameters for hydraulic fracturing, crustal stress can determine the size, orientation and distribution of cracks as well as influence the fracturing stimulation. The differential ratio of the maximum and minimum horizontal stresses (i.e., orthorhombic differential horizontal stress ratio, ODHSR) is an important factor to evaluate whether the area will have a greater tendency to fracture into a network. In this paper, we present the method of estimating stress based on azimuthal pre-stack seismic data, which is used to guide hydraulic fracturing. Firstly, the elastic and anisotropic parameters of the formation are obtained from inversion of azimuthal pre-stack seismic data. Secondly, based on the approximation formula of ODHSR, we estimate the ODHSR using the inverted elastic and anisotropic parameters of the formation. Finally, pre-stack seismic data of a work area is utilized to validate the application of the proposed stress prediction method. The practical test shows that the method can efficiently help identify the areas that are easy to create crack networks.
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