Lithologic oil reservoir prediction method based on geophysical triplexing technology

Abstract

The invention discloses a lithologic oil reservoir prediction method based on a geophysical triplexing technology. The lithologic oil reservoir prediction method comprises the steps of: utilizing a well-constrained wave impedance inversion technology to acquire a lithologic trap range of sandstone in a working area, transforming three-dimensional seismic data volume from a time domain into a frequency domain to obtain a range of seismic amplitude attributes with an abnormal difference value, and judging whether other lithologic traps contain oil and gas according to a quotient value of a low-frequency amplitude energy body and a high-frequency amplitude energy body of a known exploratory well. The lithologic oil reservoir prediction method is suitable for predicting the lithologic oil reservoir of a large-scale working area under the condition of low well control degree, is particularly suitable for areas with high sand-mud interactive mixing degree, little difference of sand-mud waveimpedance value domain, difficult-to-identify lithologic boundary on a plane and the like in which accurate judgment of oil reservoir cannot be carried out by adopting an ordinary oil reservoir prediction method, and has a prediction accuracy rate of the lithologic oil reservoir up to 80% or more.

Description

technical field [0001] The invention relates to the technical field of lithologic reservoir prediction, in particular to a lithologic reservoir prediction method based on geophysical triple technology. Background technique [0002] Lithologic oil reservoirs are oil reservoirs stored in lithological traps, a large part of which occurs on the slope of the depression, which is located on the source supply channel and close to the oil source, where sandstone and mudstone are in extensive contact, presenting Interaction; this is the prerequisite geological condition for lithologic traps to form lithologic reservoirs. Conventional reservoir prediction and hydrocarbon-bearing prediction are carried out based on conventional seismic data volumes, seismic attributes are extracted, combined with inversion. This method has a certain predictive effect on areas where the sandstone-mudstone is well differentiated and the value ranges of their wave impedances are obviously different; this...

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Problems solved by technology

This method has a certain predictive effect on areas where the sandstone-mudstone is well differentiated and the value ranges of their wave impedances are obviously different; this makes the applicability of the method narrow; in the process of lithologic reservoir exploration, A large part of the work area faces the following technical contradictions: extracting conventional attributes, it is difficult to effectively distinguish the boundaries of lithological bodies on the plane, and lithological traps cannot be identified. Distinguishing between sandstone and mudstone, oil-bearing prediction has multiple solutions

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