Method for confirming sand lens gathering oil gas critical conditions

Abstract

The invention provides a method for confirming sand lens gathering oil gas critical conditions. The method for confirming the sand lens gathering oil gas critical conditions comprises filling surrounding rock simulation with oil saturability achieves a saturability limiting value and filling sand simulation with water saturability achieves a saturability limiting value into the reserved space inside the surrounding rock simulation; taking out the sand simulation inside the surrounding rock simulation after a scheduled time; confirming an oil saturation of the sand simulation; enabling grain diameter of the surrounding simulation and sand simulation and the soil saturation to be served as a group of oil saturation data; changing the grain diameter of the surrounding rock simulation or changing the grain diameter of the sand simulation and repeatedly performing the above steps until a plurality groups of oil saturation data is obtained; confirming the sand lens gathering oil gas critical conditions according to the plurality groups of oil saturation data. The method for confirming the sand lens gathering oil gas critical conditions effectively guides exploration of sand lens oil and gas reservoirs due to the fact that the sand lens gathering oil gas critical conditions are provided quantitatively.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method for determining critical conditions for oil and gas accumulation in sandstone lenses. Background technique [0002] With the deepening of petroleum exploration technology, more and more sandstone lens oil and gas reservoirs have been discovered, and more and more attention has been paid to them. Sandstone lens reservoirs are a kind of lithologic reservoirs, which refer to the reservoirs formed in various lens-shaped, strip-shaped or irregular-shaped permeable reservoir rocks surrounded by low (non-)permeable rock layers. . The accumulation mechanism of sandstone lens reservoirs is the primary issue in the study of such reservoirs. [0003] At present, there are mainly the following academic viewpoints on the accumulation mechanism of sandstone lens reservoirs: [0004] 1) Under the action of capillary pressure, oil and gas flow from source rocks into lar...

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Problems solved by technology

[0010] From the above analysis, it can be seen that most of the current studies on the accumulation of oil and gas accumulation in sandstone lenses are at the stage of qualitative description, and there is no quantitative research on the critical conditions for the accumulation of oil and gas accumulation in sandstone lenses, and there is a lack of quantitative analysis for the actual oil and gas reservoir exploration. or semi-quantitative guidance criteria, so it is difficult to effectively guide the exploration of sandstone lens reservoirs

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