反射波成像与纵波径向速度成像在华北油田裂缝型碳酸盐岩储层勘探开发中的联合应用

doi:10.11720/wtyht.2020.1289

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Abstract

Because of complex reservoir forming conditions,strong heterogeneity and indistinct regularity of conventional logging response,it's difficult to conduct exploration effectively in the carbonate reservoir.The effectiveness evaluation of fractured reservoir is the main problem in the exploration and development of deep oil and gas.Seismic survey is limited to identitying small scale fractures or faults because of low resolution,and it is difficult for conventional logging method to accurately evaluate the geological characteristics because of the shallow investigation depth.The dipole shear wave imaging technique has been developed in recent years,which can image borehole acoustic reflectors within the range of 20~30m based on low frequency of dipole shear wave.Monopole radial profiling of compressional slowness can be used to retrieve P-wave velocity variation in well bore within 1m,which can indicate the reversibility of the reservoir.The dipole shear wave imaging is a good way for finding the extension of the wellbore fractures and the concealed fractures near the well,and monopole radial profiling of compressional slowness can reflect the change of P-wave velocity near the wellbore.In a comprehensive way,the reservoir with such characteristics as well developed fractures,long extension of fractures or existence of concealed fractures near the well bore and remarkable variation of compressional slowness indicates great potential for reservoir reconstruction.This method was applied to processing several wells in Hexiwu Qianshan in Huabei Oilfield,and the results correspond well with the results of liquid production after the reservoir reconstruction,and hence the method is worthy of further popularization and application.

Key words： fractured carbonate carbonate reservoir dipole shear wave reflection P-wave velocity variation reservoir reconstruction

Received: 22 May 2019 Published: 22 April 2020

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	Articles by authors
	Xiu-Gang MA
	Jun ZHOU
	Wen-Yuan CAI
	Wei WANG
	Wei-Gao YU
	Xian-Jun CAO
	Pei SUN

Cite this article:

Xiu-Gang MA,Jun ZHOU,Wen-Yuan CAI, et al. The combined application of reflective wave imaging and P-wave velocity variation to the exploration and development of fractured carbonate reservoirs of North China Oilfield[J]. Geophysical and Geochemical Exploration, 2020, 44(2): 271-277.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1289 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I2/271

Inversion process of P-wave velocity variation

Attenuation change with propagation distance of Monopole and Dipole source

Occurrence extraction of Structure

Contrast of dipole shear wave reflection imaging between first run and the second of well AT1X

Reflective wave imaging and P-wave velocity variation result of well AT1X

Reflective wave imaging and P-wave velocity variation result of well AT2X and AT3

Reflective wave imaging and P-wave velocity variation result of well AT4X

Logging interpretation conclusion and oil test data

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