Strong heterogeneity，poor reservoir connectivity and complex micro-pore structure are the reasons for the high difficulty and low accuracy in evaluating the productivity of tight sandstone reservoir gas.This paper used various well logging and mud logging curve data，summarizes the typical curve type，and the mathematical method to form is used for quantitative characterization，logging curve evaluation method is proposed based on the test of production capacity.Results show that total hydrocarbon curve can be divided into six types，including box shape，half box shape，positive triangle，inverted triangle，sawtooth shape，single peak，etc.，which are closely related to the level of oil and gas reservoir layer.Six types of total hydrocarbon curve can be quantified by amplitude，relative centroid，relative sawtooth，variance and the parameter value of the autocorrelation function.The box-shaped total hydrocarbon gas logging curve is full and has a large scale.Half box shape total hydrocarbon gas logging curve peak scale is significantly smaller than the reservoir thickness.Triangle shape total hydrocarbon gas logging curve is a positive triangle or an inverted triangle.Sawtooth shape total hydrocarbon gas logging curve has a tendency of high and low，which shows a number of spikes.Single peak shape total hydrocarbon gas logging curve is small，with a single peak.There is a good relationship between the 6 kinds of total hydrocarbon gas logging curves and the gas tight sandstone reservoir production capacity.The high and middle gas pay layers are mainly box shaped and triangular，and the lower production layer is mainly (half) box shape，triangle and zigzag pattern.However，the low gas pay layers is mainly sawtooth pattern，and the non-production layer is mainly single peak shape.The comprehensive interpretation of the total hydrocarbon gas logging curve and log resistivity curve can more accurately distinguish the production capacity of tight sandstone gas reservoirs.Finally，the quantitative model is used for automatic interpretation.Through data verification and analysis，it is found that the coincidence rate of production gas pay layer is 80.95%，and the coincidence rate of production capacity is 78.05%.It is proved by practice that the formation gas capacity of tight sandstone gas reservoir can be predicted based on the shape of logging and mud logging well curve.
Yin Sen-lin, Cheng Le-li, Liu Zi-xiong, Chen Ling, Chen Gong-yang, Feng Wei, Luo Ying-chun
. Evaluation of production capacity to tight sandstone reservoir based on logging and mud logging curve[J]. Natural Gas Geoscience, 2018
, 29(11)
: 1627
-1638
.
DOI: 10.11764/j.issn.1672-1926.2018.09.003
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