Method for identifying rift lake basin steep slope zone nearshore subaqueous fan sedimentary facies belt

Abstract

The invention provides a method for identifying a rift lake basin steep slope zone nearshore subaqueous fan sedimentary facies belt, which comprises the steps of 1, acquiring seismic data of a block,conventional well logging data of a drilled well and well logging lithologic data; 2, determining single well sedimentary facies by using single well synthetic record calibration; 3, summarizing seismic facies characteristics of the nearshore subaqueous fan sandstone rock through a well-tie seismic section according to each single well synthetic record calibration; 4, identifying a sedimentary facies belt interface according to the seismic facies characteristics of the nearshore subaqueous fan sandstone rock; 5, dividing the sedimentary facies belt interface; and 6, determining planar distribution of the nearshore subaqueous fan sandstone rock sedimentary facies belt according to the combination of the seismic section and a well-tie sedimentary facies contrast section. The method for identifying the rift lake basin steep slope zone nearshore subaqueous fan sedimentary facies belt identifies a sandstone rock sedimentary facies belt through combining well drilling and seismic facies characteristics, is simpler and more convenient than a test method, and is more accurate and reliable than an empirical method.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for identifying the nearshore subaqueous fan sedimentary facies belt in the steep slope zone of a faulted lake basin. Background technique [0002] Nearshore subaqueous fan glutenite reservoirs are widely developed in the steep slope of faulted lake basins, which is an important field for exploration, reserve increase and production at present and in the future. In my country's second largest oilfield - Shengli Oilfield, glutenite Body oil and gas resources account for a considerable proportion. Therefore, determining the nearshore subaqueous fan glutenite sedimentary facies in the steep slope of faulted lake basins is not only the basis for the selection of exploration targets in this type of field, but also the basis for accurate calculation of oil and gas reserves. Restricted by various factors and the limitations of traditional research methods, it is di...

AI Technical Summary

Problems solved by technology

Restricted by various factors, coupled with the limitations of traditional research methods, it is difficult to accurately determine the sedimentary facies of glutenite bodies

The previous research methods are empirical method and testing method, using well logging and mud logging data to infer the sedimentary facies belt according to the difference of lithology and physical properties, combined with section diagram and plan diagram. This method has great limitations and often Restricted by structure and well control degree, etc., it is highly subjective and lacks clear and reliable operation steps

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