Carbonate exploration method and device with weak seismic reflection characteristics

Abstract

The invention relates to a method and a device for exploring carbonate rocks with weak seismic reflection features. The method comprises the following steps of: acquiring contrary sub-waves of target stratum seismic reflection waves of carbonate rock inner weathering crusts of at least two wells; acquiring reflection coefficients of the top parts of the carbonate rock inner weathering crusts of the wells according to calibrated weathering crust seismic reflection features of the wells; loading seismic interpretation positions of the target stratums of the carbonate rock inner weathering crusts to a common reflection point trace set so as to acquire seismic sampling points, and acquiring target stratum position reflection coefficients according to the contrary sub-waves and the seismic sampling points; comparing the reflection coefficients of the top parts of the carbonate rock inner weathering crusts with the target stratum position reflection coefficients so as to judge whether the target stratum positions are superior channels; if the reflection coefficients of the top parts of the carbonate rock inner weathering crusts is judged as being accordant with the reflection coefficients of the top parts of the carbonate rock inner weathering crusts, the target stratum positions are superior channels; and overlapping the superior channels so as to acquire seismic data, and exploring the carbonate rocks with the weak seismic reflection features according to the acquired seismic data.

Description

technical field [0001] The invention relates to the field of exploration, in particular to a carbonate rock exploration method and device with weak seismic reflection characteristics. Background technique [0002] In the prediction of carbonate rocks for a certain scale of favorable reservoirs such as the densely developed zone of pores and vugs, the zone of densely developed caves and fractures (described in terms of aspects, the following three types of reservoirs: Collectively referred to as favorable reservoirs), often only pay attention to the "beaded" (strong amplitude) seismic reflection characteristics, which are considered to be the seismic response characteristics of favorable reservoirs. [0003] Exploration results in recent years have shown that the success rate of drilling "beaded" seismic reflections in Ordovician carbonate formations in the Western Basin of China is very high, and the reservoir drilling rate of exploratory wells can reach more than 90%. In t...

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Problems solved by technology

[0004] However, in the actual drilling process, it is found that there is no obvious response on the seismic profile of the weak amplitude reflection feature, and it cannot be directly identified

There is no "target" for well positioning, which restricts the exploration and production of oilfields

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