Method for petroleum exploration by using natural seismic data and method for evaluating expansion of known oil field mining

Abstract

The invention provides a method for petroleum exploration by using natural seismic data. The method is characterized by: real-timely collecting original data of a plurality of flow earthquake stations in a petroleum exploration area; extracting teleseismic data with proper an epicentml distance and a magnitude, correcting, filtering and selecting the effective data; calculating and selecting a receiver function; through receiver function waveform simulation, determining n layers of settled layers in the petroleum exploration area; using a simulation superposition searching method to calculate thicknesses of the settled layers and a wave velocity ratio; making the wave velocity ratio of the n layers of the settled layers in the petroleum exploration area form a background value and comparing with all the wave velocity ratio of the stations; if the wave velocity ratio of the nst layer of the settled layer under one station is larger than the background value of the wave velocity ratio in the petroleum exploration area, considering that there is the petroleum under the station; if the wave velocity ratio of the nst layer of the settled layer under one station is smaller than the background value of the wave velocity ratio in the petroleum exploration area, considering that there is not the petroleum under the station. The invention also provides method for evaluating expansion of known oil field mining.

Description

technical field [0001] The invention belongs to the technical field of oil resource exploration and oil resource reserve evaluation, and relates to a method for oil resource exploration and oil resource evaluation using natural seismic data. Background technique [0002] The strong continental-continental collision between the Indian plate and the Eurasian plate and the continuous backlog effect, as well as the extensive tectonic movement that occurred in the Cenozoic of the Asian continent - the Himalayan movement (Jia Chengzao et al., 2006), led to the development and finalization of the Bohai Bay Basin . In the early Tertiary, the Bohai Bay Basin was a segmented fault depression, and in the Late Tertiary, it was a unified depression. Each depression is an independent sedimentary unit, and the sediments produced form dark organic rocks in a reducing environment, which constitute rich source rocks. The oil and gas reservoirs discovered in the Bohai Bay Basin are mainly dis...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the difficult problem of wave velocity ratio extraction in traditional exploration geophysical technology, the purpose of the present invention is to use the extraction of converted seismic phases to accurately and uniquely calculate the thickness and wave velocity ratio of sedimentary layers, coupled with receiver function waveform simulation technology, for regional Exploration of oil and natural gas resources, evaluation of oil and natural resource reserves, and technical support for the expansion of known oil fields

Images