一种基于随钻VSP地震地质导向的钻井轨迹高效优化方法及其应用

doi:10.11720/wtyht.2019.1196

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Abstract

There are several Ordovician carbonate fractured-vuggy type oil and gas fields in the Tarim Basin.With the continuous development and production of the reservoirs,the small and medium sized fractured-vuggy systems have become the main targets of capacity development.In the process of exploration and development,due to the influence of complex formation velocity,there is a certain error in seismic migration data,which often leads to the failure of drilling.In this paper,an efficient drilling track optimization method based on VSP data for seismic data processing is proposed.First,the VSP velocity and the new triangular mesh model are used to effectively correct the original seismic migration velocity field,and then the modified anisotropic parameter field is used for quick migration.Secondly,the structural characteristics of the whole strata are analyzed in the new data,the positions of the reservoirs are predicted,and the targets are determined.Finally,according to the engineering and geological conditions,the most economical optimal design of the drilling trajectory is used to drill into the target.The application shows that the relatively good effect is obtained in Tazhong area of Tarim Oilfield,and the imaging quality of seismic data has been improved obviously.After well track adjustment,the rates of drilled reservoir and the directly put on production are increased by 16% and 13.2% respectively.The low cost and effective development plan of the oilfield is effectively promoted and implemented.

Key words： efficient drilling track optimization VSP driven migration velocity feild pre-stack migration imaging fractured-vuggy carbonate Tarim Basin

Received: 22 May 2018 Published: 10 April 2019

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	Articles by authors
	Jing-Ya YANG
	Xiang-Wen LI
	Yong-Lei LIU
	Bo XU
	Jiang-Tao GAO
	Mao WANG
	Jiang-Yong WU
	Quan ZHANG

Cite this article:

Jing-Ya YANG,Xiang-Wen LI,Yong-Lei LIU, et al. An efficient method for drilling trajectory optimization based on seismological and geological guidance of VSP data during drilling and its application[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 257-265.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1196 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/257

The research route of VSP seismic geological guidance technology while drilling
a—the general process of VSP seismic geological guidance technology while drilling,including;b—TTI anisotropic parameter field construction process and geological interpretation;c—trajectory adjustment process;the velocity in the process is the velocity of vertical propagation of P-wave;δ:the coefficient of variation (describing the degree of variation of vertical velocity);ε:the intensity of P-wave anisotropy (describing the difference between horizontal and vertical velocity);θ:the dip angle of formation;Φ:the azimuth angle

a—the results of elastic wave equation simulation and reverse time migration processing;b—the results obtained by the same processing method as figure a;c—the results obtained by the same processing method as figure a;d—the results obtained by the same processing method as figure a;e—the isotropic velocity field corresponds to figure b,the velocity in the black virtual frame is 98% of the value of the velocity field in figure d;f—the isotropic velocity field corresponds to figure c,the velocity in the black virtual frame is 102% of the value of the velocity field in figure d
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Forward analysis of the effect of velocity errors on "beads" imaging in horizontal formation
a—the results of elastic wave equation simulation and reverse time migration processing;b—the results obtained by the same processing method as figure a;c—the results obtained by the same processing method as figure a;d—the results obtained by the same processing method as figure a;e—the isotropic velocity field corresponds to figure b,the velocity in the black virtual frame is 98% of the value of the velocity field in figure d;f—the isotropic velocity field corresponds to figure c,the velocity in the black virtual frame is 102% of the value of the velocity field in figure d

A forward model for the effect of lateral velocity variation on migration and relocation of beads in shallow strata

A comparison of the results of forward model stacking depth migration showed in the figure 3

Comparison of modeling effect between triangular mesh algorithm and Petrel conventional construction
a—based triangular mesh algorithm is used to construct a stratigraphic plane grid in the modeling results;b—the conventional structural modeling results using Petrel in the same as the stratigraphic plane grid shown in figure a;c—the constructing A-A’ section based on triangular mesh algorithm;d—conventional structure modeling A-A’ section using Petrel

Velocity contrast map (curve,profile) and well-seismic calibration profile based on VSP driving processing
a—the stacking contrast of VSP velocity,pre-correction seismic velocity and post-correction seismic velocity;b—original seismic velocity field cross-well profile;c—the velocity field cross-well profile modified by VSP data;d—the VSP calibration results based on new migration imaging seismic data

Seismic migration profile and RMS amplitude attribute contrast map of WELL1 well before and after VSP drive processing
a—seismic profile of migration processing data driven by VSP data;b—old seismic data profile;c—reservoir prediction plane pap of migration processing data modified by VSP data;d—reservoir prediction plane map based on old data

Contrast map of RMS amplitude attributes of data before and after multi-well VSP combined drive processing

Statistical table of lost circulation and emptying and reservoir modification during drilling with VSP-driven data processing in Tazhong area

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