Method for confirming reservoir forming time of volcanic rock type oil and gas reservoir

Abstract

The invention discloses a method for confirming the reservoir forming time of a volcanic rock type oil and gas reservoir. The method comprises the following steps: firstly, selecting an experimental sample; secondly, simulating a thermal history of the volcanic rock reservoir; thirdly, confirming a reservoir forming stage of the volcanic rock type oil and gas reservoir; fourthly, confirming the reservoir forming time of the volcanic rock type oil and gas reservoir. The method indirectly obtains the reservoir forming time of the volcanic rock type oil and gas reservoir on the basis of research on the thermal evolution history of the volcanic rock reservoir and a fluid inclusion forming stage, eliminates influence of volcanic rock diachronism, burial history, thermal history, reservoir forming history and the like on confirmation of the reservoir forming time of the volcanic rock type oil and gas reservoir, improves the accuracy for confirming the reservoir forming time of the volcanic rock type oil and gas reservoir, and provides more accurate guidance on exploration and development of volcanic rock type oil and gas.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for determining the accumulation time of volcanic rock oil and gas reservoirs. Background technique [0002] More than 100 countries / regions around the world have discovered oil and gas reservoirs or oil and gas shows in or around volcanic rocks, showing broad prospects for the exploration of volcanic rock oil and gas reservoirs. Volcanic rock has changed from a "forbidden zone" for oil and gas exploration to a "target area" and has become a new target for oil and gas exploration. Exploration shows that the volcanic oil and gas reservoirs with industrial value are mainly of organic origin, that is, the organic hydrocarbons in the surrounding rocks migrated into the volcanic rocks to accumulate and accumulate. Compared with sedimentary oil and gas reservoirs, volcanic rock oil and gas reservoirs change rapidly vertically and horizontal...

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the application of this technology to volcanic oil and gas reservoirs: First, the burial history curve of a single well is calculated based on various parameters of the sedimentary strata, and the volcanic rock has a strong ability to resist compaction, so the burial history curve of a single well is difficult to be accurate Reflect its burial history and thermal history over time

Second, volcanic rocks are often diachronic, and the same volcanic body cannot be represented by a single burial-thermal history curve

Third, for reformed basins with frequent volcanic-tectonic activities, oil and gas have multi-stage accumulation and adjustment characteristics, and traditional methods often have multiple solutions

With the continuous improvement of oil and gas exploration in volcanic rocks, the requirements for determining the time of oil and gas accumulation are getting higher and higher. The existing technical methods can no longer meet the requirements, and it is necessary to develop a more accurate method for determining the time of oil and gas accumulation in volcanic oil and gas reservoirs.

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