Superimposed basinoil gaspool-forming periodrock porosity recovering method

Abstract

The invention provides a superimposed basin oil gas pool-forming period rock porosity recovering method. The superimposed basin oil gas pool-forming period rock porosity recovering method comprises the steps that Step 1, recovery of stratum denudation quantity is carried out; Step 2, a thermal evolution history model is established; Step 3, pool-forming periods of target layer oil gas in an area and stratus temperatures of all the pool-forming periods are determined; Step 4, a compaction porosity model in the process of burying is established; Step 5, a surface-porosity-porosity model is established; Step 6, an organic acid corrosion porosity model in the process of burying is established; and Step 7, according to the compaction porosity model in the Step 4 and the organic acid corrosion porosity model established in the Step 6, a pool-forming period porosity model is established. The superimposed basin oil gas pool-forming period rock porosity recovering method enriches a quantitativeevaluation of corrosion porosity in the processes of multi-period pool-forming, can be widely applied to an evaluation of porosity in the process of superimposed basin multi-period pool-forming, andhas important guiding significancesfor oil gas exploration.

Description

technical field [0001] The invention relates to the technical field of oil and gas geological exploration, in particular to a method for restoring rock porosity during the oil and gas accumulation period in superimposed basins. Background technique [0002] Low-permeability oil and gas resources occupy a very important position in my country's oil and gas resources, and are also the main targets of future oil and gas exploration in China. The formation of low-permeability reservoirs is mainly affected by sedimentation and later diagenesis. Sedimentation mainly controls the physical properties of reservoirs, while compaction and cementation in diagenesis can damage the physical properties of reservoirs, and dissolution can improve reservoir properties. Layer properties. Most of the existing reservoir evaluation systems are static evaluations, and the reservoir physical properties in the critical accumulation period that really determine whether oil and gas enter the reservoi...

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Problems solved by technology

The disadvantage of the compaction trend method is that it does not consider the influence of other factors, and in terms of the pore-depth relationship, the porosity distribution range at the same depth is relatively large, which makes it difficult to restore the ancient porosity.

The disadvantages of the inversion backstripping method are: this method has great limitations in practical application. First, this method has a large workload and requires a variety of data, which is only suitable for areas with relatively high degree of exploration; Secondly, this method also has certain requirements for the reservoir, for example, the matrix content of the reservoir is relatively low, fractures should not develop, and the particle size should be moderate; third, there are still some difficulties and problems in this method, such as in On the stage distinction of multi-cycle diagenesis types, on the conversion of surface porosity to porosity, how to calculate the influence of clay mineral cement on reservoir physical properties, etc.

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