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Discussion on an Evaluation Method of Shale Oil and Gas in Jiyang Depression: A Case Study on Luojia Area in Zhanhua Sag
详细信息   
摘要
Shale oil and gas are one of the unconventional hydrocarbon resources.Characteristics of continental rifted basins determine the complexity of the shale oil and gas exploration in such a basin and no existing experience can be used for reference.Through a study on the Luojia area in the Jiyang Depression,an evaluation method for shale oil and gas in continental rifted basins was preliminarily established.With which a favorable area of shale oil and gas was determined based on the analysis of petroleum geological conditions and a high-frequency sequence stratigraphic framework of the target area was consequently built up,where shale spatial and temporal distribution could be confirmed.A shale lithofacies classification criterion was established according to rock textures,structure,composition and color,and high-quality lithofacies were demarcated,tracked and forecasted with logging data.Abundance,types and maturity of organic matter were analyzed by means of geochemical analyses and hydrocarbon generation simulation,and geochemical parameter criteria for shale hydrocarbon generation and occurrence were determined as well.A model for the interpretation of reservoir logging parameters was established through studying space types,combination and evolution of shale reservoirs by means of core observation,thin-section analysis,electron microscopy and fluorescence spectrometry.The reservoir performance was evaluated combined with the analysis of reservoir physical properties.A saturation model was established based on core analysis,logging interpretation,and well-test and production-test data in order to evaluate movable hydrocarbon contents and carry out integrated identification of oil potential.Finally,the prediction of shale oil and gas production and exploration prospects in the study area was made by analyzing influential factors of deliverability and rock compressibility.Through comprehensive evaluations on lithofacies,source rocks,accumulation quality and deliverability,shales in the Luojia area were divided into three types,i.e.type I(high porosity and high resistance),type II(medium porosity and medium resistance) and type Ⅲ(low porosity and medium resistance).Guided by this division,three horizontal wells including Well Boyp-1 were located.

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