Construction method for isochronous stratigraphic framework of platform-sea groove facies region based on underground and outcrop data

Abstract

The invention discloses a method for constructing an isochronous stratigraphic framework of a terrace-sea trough facies region based on underground and outcrop data, which comprises the following steps of: on the basis of drilling and field section data and under the guidance of a sequence stratigraphic principle, determining rock types and development characteristics through technical means of microscopic structure analysis, spectral analysis and macro-micro combination, and establishing an isochronous stratigraphic framework of the terrace-sea trough facies region; and determining a rock phase sequence combination, establishing a matching relationship between the rock and a logging curve, and constructing an isochronous stratigraphic framework of the earth surface belly cross-phase region in combination with actually measured radioactive curve data of a field section. The method has the advantages that the problem of insufficient data is solved and made up, the isochronous stratigraphic framework can be constructed for the carbonate rock strata with low seismic resolution and thin strata thickness, data support is provided for ancient landform recovery and lithofacies paleogeography recovery, exploration cognition is improved, and exploration risks are reduced.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, in particular to a method for constructing an isochronous stratigraphic framework for the platform-ocean trough facies zone based on the combination of downhole and outcrop data. Background technique [0002] The isochronous stratigraphic framework is the basis of various geological studies for oil and gas field development, and it has important practical exploration guiding significance for sedimentary understanding and reservoir prediction. The platform-trough facies zone is not only a favorable zone for reef and shoal lithologic reservoir traps, but also a transition zone of sedimentary facies, which is controlled by complex geological background and exhibits obvious phase transition characteristics. - The accurate construction of the isochronous stratigraphic framework of the trough facies area is directly related to the deepening of sedimentary understanding and...

AI Technical Summary

Problems solved by technology

At present, the isochronous stratigraphic framework in the platform-trough facies area is mainly based on seismic and drilling data, but the seismic accuracy is limited and the identification degree is low, and the drilling data of this transitional facies is relatively scarce, resulting in the isochronous interface type and There are differences in the division schemes, and even doubts about the development of the two facies belts. Therefore, it is urgent to supplement new data, construct the isochronous stratigraphic framework of the platform-trough facies area, and clarify the isochronous interface types and division schemes to solve the current understanding Existing Controversies and Doubts

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