A Method for Evaluation of Mudstone Smear Effect Applicable to Tensional Faults

Abstract

The invention discloses a transtensional fault mudstone smearing effect evaluation method comprising the following steps: 1, determining a transtensional fault according to regional geological background and fracture combination forms; 2, using time-depth conversion to obtain an inclination slip L of the transtensional fault on an earthquake profile vertical to the fault direction; 3, obtaining asection scratch direction according to the bored fault and cored rock core observation, and obtaining an angle [alpha] between the fault total slip direction and a direction slip; 4, using a trianglefunction: L1=L / sin [alpha] to obtain the fault total slip L1; 5, projecting the logging lithology data to the geological profile, thus obtaining a lithology joint relation of different layers of two fracture plates; 6, solving the ratio between an accumulated thickness H of the fault mudstone and the transtensional fault total slip, thus obtaining a calculation formula DMSP. The method can accurately calculate and determine the transtensional fault enclosing capability, thus predicting and evaluating an oil gas migration direction.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration, and in particular relates to an evaluation method applicable to the sealing performance of tension-torsion faults. Background technique [0002] Faults are a very important structural type in oil-gas-bearing basins. Their formation and evolution not only control the structure and evolution of the basin, but also control the formation and development of traps, directly or indirectly controlling the source rocks in the basin. , Reservoir development characteristics, and control the migration and accumulation of oil and gas and the distribution of oil and gas pools. The controlling effect of faults on oil and gas accumulation is mainly manifested in the control of oil and gas migration, accumulation process and oil and gas distribution. Among them, the opening and sealing of faults play an important role in the migration and accumulation of oil and gas, as well as the destruction and re-accum...

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Problems solved by technology

[0007] In view of this, the present invention provides a quantitative evaluation method suitable for the smear effect of tension-torsion faults, which can accurately calculate and determine the sealing capacity of tension-torsion faults, realize the prediction and evaluation of oil and gas migration direction, and solve the problem of The technical defect of poor applicability of the evaluation method existing in the prior art

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