Method for compiling paleogeologic map of carbonate rock strata based on sequence stratigraphy

Abstract

The invention relates to a method for compiling a paleogeologic map of carbonate rock strata based on the sequence stratigraphy, which comprises the steps of performing division calibration on sequence strata on the basis of basic data information, building carbonate connected well profile sequence stratigraphic framework and spatial sequence stratigraphic framework, analyzing the mutual superimposition relation of different strata on the profile and spatial development characteristics and distribution rules, specifying the mode and sequence structure of rhythmic strata of carbonate rocks, anddelimiting the structural boundary and range; taking a stratum thickness map as a base map, drawing stratum boundaries corresponding to different sequence stratigraphic interfaces according to the stratigraphic superimposition relation from old to new; and then correcting the stratigraphic boundaries according to the special geological phenomenon interpreted by the existing data, supplementing map elements and thus completing the drawing of the paleogeologic map. The method not only can ensure the accuracy of geological information, but also can guide the actual exploration and development more effectively, thus reducing the risk of exploration and development, and reducing the cost input of th exploration and development.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and in particular relates to a method for compiling paleogeological maps of carbonate strata based on sequence stratigraphy. Background technique [0002] Paleogeological maps are also called subsurface geological maps and underground outcrop maps, which are geological maps showing strata of various ages that are closely below the unconformity surface, and are also the result of tectonic changes in the underlying strata caused by crustal movement when the unconformity was formed. Paleogeological maps are based on sequence stratigraphy, using seismic data, drilling or mud logging data, cores and other data, and according to the development characteristics of different strata, they are divided layer by layer to establish a sequence stratigraphic framework and determine the temporal and spatial distribution of strata in different ages. The superimposed relationship and ...

AI Technical Summary

Problems solved by technology

Previous paleogeological maps were compiled based on seismic data and drilling or mud logging data, taking into account the influence of various factors such as burial depth, lithology, and fault shielding. However, due to the impact of seismic data quality, ancient The accuracy of geological maps is difficult to guarantee

In addition, the formation of carbonate strata is controlled by many factors, and is easily modified by later karstification, which undoubtedly increases the difficulty of paleogeological mapping.

Therefore, the existing paleogeological map compilation methods cannot be directly applied to the compilation of carbonate rock paleogeological maps

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