吐哈盆地葡北地区“两宽一高”地震勘探技术及应用效果

doi:10.11743/ogg20190404

Abstract

Abstract: Precise recognition of trap and accurate prediction of reservoir distribution have always been the key factors res-tricting oil and gas discovery in Taibei sag of Turpan-Hami Basin.The signal-to-noise ratio, frequency bandwidth and resolution of seismic data have been significantly improved through seismic data acquisition of vibroseis with the "wide-band, wide-azimuth and high-density" technique, OVT domain time migration, establishment of initial velocity models for geosteering depth migration, and iterative processing of anisotropic depth migration.A good data base has been provided for the prediction of fine characterization of fracture system and sand reservoir in this area with six third-order sequences identified in the Jurassic, within which sand bodies at the bottom of Qiketai Formation and on top of Sanjianfang Formation are identified as two fourth-order sequences characterized by steadily rising semi-cycles under the guidance of high resolution sequence stratigraphy, and the comprehensive analysis of high-resolution seismic and well log data.The structure of "four belts and two depressions", together with its formation mechanism in the study area, has been revealed through analyses of structural geometric attributes and fine structure interpretation.The distribution of sand bodies in the petroliferous zones of Qiketai and Sanjianfang Formations is predicted by multiple broadband seismic inversion techniques.Based on the comprehensive analyses of structure, reservoir and hydrocarbon accumulation pattern, it's pointed out that the hydrocarbon accumulates along the ridge lines of the structural belts in the study area, and the fault system is the dominant route of hydrocarbon migration.The Qiketai and Sanjianfang reservoirs are developed in Pubei tectonic belt, thinning out to Yuguo and Shengbei sub-sags.The lithologic traps with nose-shaped structures, located at the joint of the Pubei and Yuguo tectonic belts, are favorable for making breakthroughs in oil and gas exploration.

Key words: lithologic trap, wide azimuth and high density(2W1H), vibroseis, seismic processing, sequence, structure, seismic inversion, Pubei area, Turpan-Hami Basin

CLC Number:

TE121.2

Ran Jianbin, Zhang Yishan, Li Haiyin, Chen Jia, Li Wenge, Xing Hongge, Dai Yu. The “2W1H” seismic exploration technique and its application in Pubei area, Turpan-Hami Basin[J]. Oil & Gas Geology, 2019, 40(4): 725-737.

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The “2W1H” seismic exploration technique and its application in Pubei area, Turpan-Hami Basin

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