A Prediction Method of Lithological Combination of Clastic Rock in Marine Strata

Abstract

The invention provides a marine facies stratum clasolite lithology combination prediction method, belonging to the physical geography field. The marine facies stratum clasolite lithology combination prediction method comprises steps of 1) obtaining a well-seism comparison result or a synthesis record through a deposition process-seism response contrast, establishing a template of a lithology combination and a seism response, 2) analyzing propagation characteristic differences of seism reflection waves in different lithology, performing forward reckoning on rock wave impedance characteristics, establishing a relation between the marine facies clasolite and the seism thereof response,3) using a deposition process-seism response technology and a seism wave waveform amplitude analysis technology to establish a lithology template chart combination to predict thicknesses of marine facies sandstone and mudstone, lithological combinaition and lithofacies characters. The marine facies stratum clasolite lithology combination prediction method can perform efficient identification on the lithological combination of the marine facies stratum clasolite under conditions that the seism data is dominant and well data is insufficient or even absent, and, compared with a regular method, greatly improves prediction accuracy.

Description

technical field [0001] The invention belongs to the field of prediction and identification of hydrocarbon source rocks and reservoirs in the field of seismic physics, and in particular relates to a method for predicting the lithology combination of clastic rocks in marine strata combined with geophysics and sedimentary geology. Background technique [0002] Due to the lack of drilling data in my country's deep-water areas, it is extremely difficult to identify lithological associations using only 2D seismic data. However, high-quality 2D seismic data still contain important geological response information. Determining the basic lithological associations is the key to oil and gas geological exploration. One of the important bases. Seismic response is the basis for the study of underground lithology identification. There are many identification methods and technical means for mudstone and sandstone, through direct recording of drilling cores, lithology identification using logg...

AI Technical Summary

Problems solved by technology

However, in low-exploration areas, especially in research areas where there is only a small amount of two-dimensional seismic data under the control of no well data, how to use seismic data to effectively identify mudstone and sandstone in the formation has not always had a complete and accurate system method

Predecessors proposed the relationship between formation lithology and seismic wave velocity, and tried to use velocity to predict lithology. There is also a method of using seismic attributes to make a rough prediction of source rock thickness under low exploration degree. At the same time, earthquakes in recent years Sedimentological methods have achieved good results in sedimentological research of strata, but a common problem in existing technologies is that most technical methods lack the coupling analysis of underground geological conditions and seismic reflection characteristics, which is limited by the researcher's personal The influence of previous experience is great, and the identification accuracy of lithological combination is greatly reduced

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