Abstract:

Lithologic gas reservoirs with low-permeability feature in higher heterogeneity and lower abundance and production.Through fully utilizing geologic,logging,seismic and test data and integrating geology and gas reservoir engineering with economic evaluation,this paper establishes 3-D geologic models,open-flow capacity forecast models,technical and economic limits of development,and criteria for selection and evaluation of development blocks on the basis of research on multi-information constrained stochastic modeling,the relationship between productivity and static geologic parameters,and technical and economic limit.Based on the above-mentioned research,a set of dynamic-static integrated quantitative methods are presented for the evaluation and selection of development blocks in low permeability lithologic gas reservoirs to offer a scientific strategy basis for selection of gas field development targets and construction of production capacity.The field application of the methods reveals that they are suitable for selection and evaluation of low-permeability lithologic gas reservoirs and may serve as guidance for developing reservoirs with similar nature.

Key words: low-permeability lithologic gas reservoir, multi-information constrained stochastic modeling, forecasting of open flow capacity, economic limit of development, selection and evaluation of development blocks