Volcanic zone fault sealing comprehensive evaluation method

Abstract

The invention discloses a volcanic zone fault sealing comprehensive evaluation method specifically based on Karamay oilfield volcanic rock development area. A volcanic zone fault sealing forming mechanism is mainly lithologic opposition and diagenesis. A lithologic opposition characteristic can be reflected in the aspect of the difference between the density of rock stratums on both sides. The diagenesis of a fault zone is affected by cross section pressure, closeness and the like. Through the filling of argillaceous debris and the injection of late fluid, the fault zone is strongly closed. According to the invention, a concept model of fault plane density difference is established; a variety of parameters (cross section normal stress, closeness index and the like) are combined to evaluate diagenesis closeness and docking closeness; closeness influence factors are induced; a weight factor is proposed; through a weight coefficient, a mathematical model is built to acquire a comprehensive factor; and the fault sealing is comprehensively evaluated. According to the invention, a variety of geological factors are considered; accurate requirements of fault sealing quantitative evaluation can be met; and the method can be widely applied to the field of oil and gas resource geological exploration and development evaluation.

Description

technical field [0001] The invention belongs to the field of geological exploration and development evaluation of oil and gas resources, and in particular relates to a comprehensive evaluation method for fault sealing in volcanic rock areas. Background technique [0002] The evolution process of faults is divided into active and static periods. When active, the fault opens and is the main channel for vertical migration of oil and gas. Therefore, the evaluation of fault sealing is mainly aimed at the faults in the static period. Play a sealing role or a transporting role. The evaluation of fault sealing has gone through two stages, qualitative and quantitative. Initially, the formation mechanism of fault sealing is analyzed. Sand-mud butt joint, mudstone smear, diagenetic characteristics, etc. can all produce sealing conditions, and "closed" and "non-sealed" are used to qualitatively describe faults. The sealing ability of the sealing ability; the quantitative evaluation met...

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Problems solved by technology

[0004] Although the study of fault sealing has made many important progresses with the efforts of scholars at home and abroad, there is still no mature and widely applicable evaluation method under various geological conditions, and it is still in the exploratory stage. The comprehensive evaluation of fault sealing is a systems engineering, various factors need to be considered

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