Dominant-lithology-based carbonate rock lithic facies characterization method

Abstract

The present invention provides a dominant-lithology-based carbonate rock lithic facies characterization method, which comprises: collecting the outcrop, the well boring and well logging data, the paleontological fossils and the geochemical data at the target layer section of a study area, carrying out comparing and analyzing with seismic data, and carrying out fine dividing and comparing on the stratum at the target layer section of the study area; carrying out high-frequency sequence stratigraphic dividing and comparing on the target layer section of the study area, and establishing a high-frequency sequence stratigraphic grillwork; observing, describing and classifying the outcrop and the cores of each well in the study area, and establishing a lithology evolution sequence in the targetlayer section of the study area; carrying out comprehensive calibration on the cores of each well, the outcrop, the seismic data, the well logging data and the mud logging data, determining the lithology combination characteristics, and quantitatively dividing the dominant lithology; dividing and describing the single wells and the outcrop lithic facies by using the dominant lithology; and completing a finely divided carbonate rock lithic facies profile map within the isochronous sequence stratigraphic grillwork, completing a dominant lithic facies plane layout map within the sequence stratigraphic grillwork, and completing the dominant-lithology-based characterization of the carbonate rock lithic facies.

Description

technical field [0001] The invention relates to a carbonate lithofacies characterization method based on dominant lithology, which belongs to the field of petroleum and natural gas exploration and development. Background technique [0002] Lithofacies refers to the sum of all lithological characteristics in a sedimentary rock, including mineral composition, color, grain size distribution, etc. Lithofacies change with the development of time and the change of spatial conditions. Changes in lithofacies can be observed and described from both vertical and horizontal aspects. The phase change in the horizontal direction of the same rock layer indicates the difference of natural geographical conditions in different regions in the same period, and the phase change in the vertical direction of the rock layer section reflects the change of the natural geographical environment in the same area in different periods. [0003] Oil and gas exploration in China's large basins has alread...

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Problems solved by technology

[0003] Oil and gas exploration in China's large basins has already entered the era of exploration dominated by lithologic-stratigraphic oil and gas reservoirs, and the exploration depth has gradually developed from medium and shallow layers to deep and ultra-deep layers, and the reservoirs have also expanded to low porosity and permeability sandstone, carbonate rocks and volcanic rocks Previous studies on carbonate rocks mainly focused on the analysis of organic geochemistry, pore structure, and resource potential. There were relatively few detailed studies on lithofacies, and there was no uniform division standard. More detailed lithofacies and sedimentary microfacies maps are needed, so it is necessary to establish a corresponding division scheme, carry out fine division and research of lithofacies, and identify favorable lithofacies combinations and distributions

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