Method for evaluating reservoir forming control effect on natural gas by diagenetic environment of compact sandstone reservoir

Abstract

The invention discloses a method for evaluating a reservoir forming control effect on natural gas by a diagenetic environment of a compact sandstone reservoir. According to the method, on the basis of comprehending a plurality of types of experiments, a regional burying thermo-evolution history is combined and the diagenetic environment is finely divided; a relation between the diagenetic environment and fluid filling is judged by using a formation sequence of a diagenetic phenomenon and a diagenetic ore and combining a covering body uniform temperature value and an organic component quantity in a laser-Raman spectrum testing result; especially, the diagenetic effect and the diagenetic environment are finely divided and are combined with a gas reservoir to be analyzed.

Description

technical field [0001] The invention belongs to the field of geological research, in particular to a method for evaluating the controlling effect of tight sandstone reservoir diagenetic environment on natural gas accumulation. Background technique [0002] Tight sandstone gas reservoirs refer to low porosity (<12%) and low permeability (0.1×10 -3 μm 2 ), low gas saturation (<60%), high water saturation (40%), and natural gas reservoirs in sandstone formations in which natural gas flows slowly. Such gas reservoirs are complex to form and difficult to explore, and the sequence relationship between the formation process of reservoir densification and natural gas charging and accumulation has always been a hot issue in this field. Most researchers have realized that reservoir diagenetic fluid activity and its physical and chemical conditions have an important impact on reservoir quality. Early research in this field is mainly manifested in two aspects: one is the recover...

AI Technical Summary

Problems solved by technology

For the discussion of the relationship between paleofluids and diagenesis, the predecessors were more based on the analysis data of formation water, but the existing oilfield water can not represent the characteristics of paleowater bodies after later reformation, while fluid inclusion temperature measurement and laser Raman The spectral component analysis method can judge the paleogeothermal gradient and diagenetic fluid properties when sedimentary diagenesis and accumulation occurred. Therefore, effectively combining this technology with reservoir geological experiment technology, fracture analysis technology, and regional burial thermal evolution analysis technology can be more Accurately restore the diagenetic environment, judge the time sequence of accumulation and diagenesis, and then clarify the evolution of the diagenetic fluid environment, the mechanism of reservoir densification, and the relationship with the reservoir. Gas reservoirs have important theoretical and practical significance

Images