High-resolution sequence stratigraphic division and comparison method

Abstract

The invention discloses a high-resolution sequence stratigraphic division and comparison method. The high-resolution sequence stratigraphic division and comparison method comprises the following steps: S1, designing combine detection of key well coring and an analysis laboratory test, and sampling; S2, calculating superior cycle thicknesses with different grades; S3, carrying out analysis laboratory test curve type cyclic analysis; S4, carrying out logging curve combined calibration and model establishment; S5, carrying out high-frequency sequence comparison and establishing a high-frequency sequence framework. The high-resolution sequence stratigraphic division and comparison method disclosed by the invention has the beneficial effects that a practicable technical system is provided for exploration and development of oil gas of a fine-grain phase region, especially longitudinal and transverse spreading ranges of a sweet spot and a distribution rule thereof, preference of a well site and the like. The high-resolution sequence stratigraphic division and comparison method has high research precision of sequence identification and division and can be used for relatively accurately carrying out identification and division on five-grade, six-grade, even seven-grade sequences, so that requirements on current refined exploration are met; however, a method in the prior art only can berelatively accurately applied to division of low-frequency sequences of a conventional coarse grain phase belt.

Description

technical field [0001] The invention relates to a stratigraphic division and comparison method, in particular to a high-resolution sequence stratigraphic division and comparison method, and belongs to the technical field of petroleum exploration and development applications. Background technique [0002] With the continuous deepening of exploration and development, the exploration field is continuously extending from the coarse-grained conventional facies belt to the fine-grained sedimentary zone. It is predicted that the geological reserves of tight oil and gas and shale oil and gas contained in fine-grained facies areas account for more than 50% of the total reserves, and have great exploration potential. Many areas at home and abroad, such as Chang 7 in the Ordos Basin, Jimsar in the Junggar Basin, The Jurassic in the central Sichuan Basin, the Bakken in the Williston Basin in North America, and the Eagle Ford in the West Gulf of Mexico Basin have formed scales in the exp...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a comprehensive method for high-frequency sequence division and grid establishment based on multi-parameters such as geochemistry, rock ore, and elements combined with "analytical assay curves" in order to solve the above problems, and forms a set of Reasonable, effective, and operable method steps solve the problems of lack of high-frequency sequence division and framework establishment methods and inconsistent standards in fine-grained facies areas. This method is applied to theoretical research and actual production research of fine-grained facies areas. It can effectively clarify the vertical and horizontal distribution range and distribution law of the sweet spots, and refer to the exploration and development of tight oil and gas and shale oil and gas

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