Method for predicting distribution of thin reservoir of platform beach under constraint of sequence framework

Abstract

The invention provides a prediction method for thin reservoir distribution of a platform land beach under constraint of a sequence framework, which comprises the following steps of: (1) observing and sampling a rock core, and grinding rock slices; (2) core homing is carried out, and a standard well sequence stratum is established; (3) respectively establishing a transverse sequence framework and a longitudinal sequence framework, and determining sequence stratum characteristics of a target layer; (4) determining the sedimentary facies type, and establishing a sedimentary combination sequence; (5) reservoir formation causes corresponding to the isochronous geologic body are analyzed; (6) analyzing a control mechanism, and judging the exposure time of the particle beach in the reservoir; (7) judging whether the relationship between the thickness of the isochronous geologic body and the accumulated thickness of the reservoir is a positive correlation; (8) establishing a relation curve between the thickness of the isochronous geologic body and the productivity of the reservoir; and (9) predicting the most favorable reservoir region, the secondary favorable reservoir region and the general reservoir region. The method realizes prediction and evaluation of unknown geologic body reservoirs, and has guiding significance for favorable area screening, well location deployment and the like.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field exploration, and in particular relates to a method for predicting the distribution of thin reservoirs in platform beach facies under the constraint of a sequence framework. Background technique [0002] Recently, with the deepening of oil and gas exploration, the proportion of lithologic oil and gas reservoirs is increasing, and more and more attention has been paid. Beach facies reservoirs in marine carbonate rock platforms are one of the main types of oil and gas reservoirs. Due to their strong heterogeneity, the formation mechanism and distribution of these reservoirs are studied. significant. [0003] Tan Xiucheng et al. reported the formation mechanism of granular rock reservoirs in carbonate rock platforms. Their research shows that the micro-geomorphic highlands located above the wave base and close to the sea level have the strongest wave action and the fastest deposition rate. ...

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Problems solved by technology

[0004] The formation mechanism disclosed in the above report can provide an important theoretical basis for marine oil and gas exploration. However, there is still no specific and feasible prediction method for the distribution of shoal reservoirs in marine carbonate platforms.

At present, the commonly used reservoir distribution prediction method is seismic reservoir identification technology. However, this technology can only identify reservoirs with a thickness greater than 10 m. Thin reservoirs are not suitable

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