Method and device for predicting wave and depth of weathering leaching of volcanic rock weathering crust

Abstract

The invention discloses a volcanic rock weathering crust weathering leaching wave and depth prediction method and device, and the method comprises the steps: depicting the ancient landform of a preset volcanic rock weathering crust work area in a deposition period based on the denudation amount recovery ancient landform depiction technology, so as to obtain an ancient landform map; obtaining relative highest point altitude depth data of drilled wells in the preset volcanic rock weathering crust work area according to the ancient landform map; obtaining weathering leaching wave and depth data corresponding to the relative highest point altitude depth data according to the drilling data of the drilled well in the preset volcanic rock weathering crust work area; establishing a relation model according to the relative highest point altitude depth data and the weathering leaching wave and depth data; and obtaining the weathering leaching wave and depth data of the target undrilled well point by using the relation model. According to the method, the alternative parameters of the deposition interruption time can be found, the limitation of small drilled data volume is overcome, and the accuracy of obtaining the weathering leaching wave and depth data of the target undrilled well point by using the relation model subsequently is ensured.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a sweep depth prediction method and device for weathering and leaching of volcanic rock weathering crust. Background technique [0002] The weathering crust of volcanic rocks refers to the layered geological bodies formed by physical and chemical weathering of volcanic rocks in the supergene environment under the background of uplift. The deep volcanic rock reservoirs are deeply buried, and the late diagenesis of the reservoirs is strong. The physical properties are mostly low porosity and low permeability. When it is not weathered, it is generally difficult to be an effective reservoir. However, under the action of strong weathering and leaching, volcanic rocks can be reformed, thereby developing dissolved pores and fractures, and then forming effective reservoirs. It can be said that weathering and leaching is the most important role in the formation of secondar...

AI Technical Summary

Problems solved by technology

[0004] However, the existing technology is limited by the amount of drilled sampling data, the age data of volcanic rocks obtained through sample dating is limited, and the inferred data of depositional discontinuity time are also limited, so it cannot accurately predict the weathering leaching filter and depth of weathering crust in undrilled areas

Images