Comprehensive evaluation method for single well oil gas geology

Abstract

The invention relates to a comprehensive evaluation method for single well petroleum geology. The method comprises the following steps: 1, source rock evaluation; 2, reservoir stratum evaluation; 3, overlying stratum evaluation; 4, entrapment evaluation; 5, oil gas source comparison. According to the comprehensive evaluation method for the single well oil gas geology, the sequence stratigraphy theory serves as guidance, systematic observation of rock debris and the core and sample analysis serve as the bases, physical geography materials such as logging are combined, system partitioned strata are compared with adjoining wells, target stratum series sedimentary facies markers, sedimentary facies types and characteristics, stratigraphic sequence characteristics and sedimentary cycles, structures and structural characteristics are researched, sedimentary facies, cored interval sedimentary microfacies and comprehensive logging interval sedimentary microfacies are partitioned, sedimentary environment analysis is conducted, a single well facies model and whole well sedimentary facies sections are established, the mutual relations between the sedimentary facies and a crude stratum, a reservoir stratum and an overlying stratum are defined, and outlining basis is provided for conducting single well oil gas geology basic element analysis.

Description

technical field [0001] The invention relates to a single well oil and gas geological comprehensive evaluation method. Background technique [0002] Subei Basin is a Mesozoic and Cenozoic fault-depression basin. The pre-Jurassic basement is composed of Indosinian-Yanshanian folded Paleozoic and Triassic strata. The formation and development of the basin experienced a depression period-fault depression There are five depositional stages: stage-rifting stage-turning stage-depression stage. The Mesozoic and Cenozoic sedimentary rock series developed in the FE sub-sag in the basin, with a sedimentary thickness of up to 5200 km. From bottom to top, the main deposits filled the Upper Cretaceous Pukou Formation (K2p), Chishan Formation (K2c), Paleogene Taizhou Formation ( E1t), Funing Formation (E1f), DN Formation (part of E2d), SD Formation (E2s), Neogene Yancheng Formation (Ny) and Quaternary DT Formation (Qd). Stratum deposition was controlled by tectonic movements. After the Y...

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Problems solved by technology

[0003] Shale oil and gas reservoirs belong to the category of unconventional oil and gas reservoirs, but they are different from tight sandstone oil and gas reservoirs. The biggest difference lies in the integration of source and storage. Therefore, oil and gas displacement, occurrence state, storage space and stimulation methods all have their own unique characteristics. At present, domestic evaluation methods for mud shale oil and gas are not yet mature, and are still in the exploratory stage.