A Quantitative Evaluation Method for Oil and Gas Vertical Splitting Ratio under Break-Cap Configuration Conditions

Abstract

The invention relates to the technical field of oil and gas exploration, and provides a quantitative evaluation method for the vertical distribution ratio of oil and gas under the condition of fault-cap configuration; it sets evaluation faults from two perspectives of migration and preservation according to four aspects: macroscopic, microscopic, space, and time. ‑Cap (fault and caprock) configuration relationship parameters, on the basis of clarifying the degree of oil and gas enrichment in different formations of each well, determine the mathematical relationship between each parameter and the vertical oil and gas split ratio between the upper and lower caprocks, and then clarify the fault‑ The control effect of the cover configuration on the longitudinal distribution of oil and gas. The invention is suitable for research areas containing oil and gas in multi-layer systems. Under the condition that the oil and gas charging conditions, reservoir conditions and other accumulation factors are basically the same, according to the quantitative evaluation of the fault-cap configuration relationship, the vertical diversion effect of the fault-cap configuration on oil and gas, and the deployment of vertical oil and gas exploration strata are clarified. is of great significance.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a quantitative evaluation method for the vertical distribution ratio of oil and gas under fault-cap (fault and caprock) configuration conditions. Background technique [0002] The practice of oil and gas exploration shows that the caprock can effectively seal the oil and gas in the region only when the spatial distribution is continuous, so that the oil and gas can accumulate and accumulate on a large scale; otherwise, it is not conducive to the large-scale accumulation and accumulation of oil and gas. Whether the caprock is continuous in space is related to its own development characteristics. The greater the thickness, the better the continuity of the caprock spatial distribution; otherwise, the worse it is. However, whether the caprock is continuously distributed in space depends more importantly on the reconstruction and damage by the fracture in the later sta...

AI Technical Summary

Problems solved by technology

The disadvantage is that the consideration factors are not comprehensive, only from the microscopic point of view, but the negative aspects such as macroscopic distribution and time effectiveness have not been designed, the evaluation mechanism is not perfect, and the control effect of the fault-cap configuration on the vertical flow of oil and gas cannot be characterized.

The disadvantage is that the method of establishing the chart is only a semi-quantitative characterization, and does not quantitatively characterize the fault-cap configuration relationship, and this method can only evaluate whether the oil and gas under the fault-cap configuration can accumulate, but cannot characterize the fault-cap configuration. The oil and gas vertical split ratio

The disadvantage is that it does not consider the brittleness and plasticity of the cap rock, and cannot characterize the control effect of the fault-cap configuration on the vertical flow of oil and gas.

[0028] To sum up: these methods are qualitative or semi-quantitative to characterize the effectiveness of the break-lid configuration, but they consider fewer factors and are not comprehensive enough

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