Method and device for reconstructing lithofacies paleogeography

Abstract

The invention provides a method and device for reconstructing lithofacies paleogeography. The method includes the following steps that: the exploration data of strata are obtained, stratum denudation and lacuna recovery are performed on the strata according to the exploration data, the thickness of strata which have been subjected to exposure denudation transformation is recovered, wherein the exploration data at least contain outcrop data, drilling data and seismic data; spatial homing is performed on the distribution and thickness of each stratum according to a volumetric balance principle, so that true distribution features of each stratum in the depositional stage can be determined; spatial homing is performed on lithological characteristics and sedimentary facies in drilling and outcrops according to the true distribution features of each stratum in the depositional stage; a recovered lithofacies paleogeographic map is constructed according to a regional background based on the lithological characteristics and sedimentary facies after spatial homing; and based on a tectonic evolution process, the distribution rule features of ithofacies which have been subjected to a plurality of stages of diastrophism according to the recovered lithofacies paleogeographic map by using sedimentation process forward modeling.

Description

technical field [0001] The present invention relates to the research technology of lithofacies paleogeography of carbonate rocks, in particular to a method and device for reconstructing lithofacies paleogeography. Background technique [0002] At present, lithofacies palaeogeography has become an important means of reconstructing the distribution of land and sea, tectonic background, basin configuration and sedimentary evolution in geological history. It plays an important role in the prediction and exploration of sedimentary minerals. The lithofacies and paleogeography research work in my country has mainly gone through three stages: ① The first stage is the small-scale lithofacies and paleogeography mapping work based on paleontology or tectonic viewpoints. Based on the understanding of environment and tectonic setting, combined with the lithological sequence, the rough frame lithofacies palaeogeography map is compiled. This mapping method reflects the regional sedimentar...

AI Technical Summary

Problems solved by technology

But there are still some problems: structural-lithographic paleogeography mainly emphasizes the joint study of structural belts and basins, and focuses on restoring the stratigraphic sequence disorder, loss, denudation and faulting activities in orogenic belts caused by changes in basin-mountain frameworks caused by plate activities Provenance area changes caused by

These two methods have very important improvements and enhancements for the restoration of lithofacies paleogeography in tectonic active areas and the improvement of the accuracy of large-scale structural paleogeographic mapping, but there are still the following problems: However, there is no research on the role of relatively stable areas in sedimentary basins; the latter’s sequence division is mainly based on drilling, outcrop fixed-point research and lateral correlation, ignoring the spatial position caused by formation deformation and displacement caused by tectonic activities Changes in characteristics such as thickness and stratum thickness, especially the local accumulation of weak strata such as mudstone, shale and gypsum-salt rock in complex structural environments, and the sliding and dislocation between upper and lower strata, so that the upper and lower lithology changes no longer reflect the real situation. Sedimentary lithology

However, for fine exploration of oil and gas and other resources, its accuracy can no longer meet the role of predicting favorable facies belts and favorable reservoir development belts that play a guiding role in exploration.

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