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Diagenesis and reservoir quality of the Upper Triassic Chang 6 member in Jingan Oilfield, Ordos Basin, China

Petroleum 2018年第2期4卷 126-133页

作者： Bin Li Jun Peng Qingsong Xia Jiatong Xie Meijianzi Han State Key Laboratory of Oil and Gas reservoir Geology and Exploitation ChengduChina School of Geoscience and Technology of Southwest Petroleum University ChengduChina Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhanChina

The Chang 6 reservoir of Yanchang formation in Jingan oilfield has relatively poor quality:the porosity ranges mainly from 8 to 14%,and permeability ranges from 0.018 to 10.48 md,with a mean of 1.10 md,categorized as low porosity and low permeability reservoir type with strong heterogeneity.Petrographic and geochemical analyses of various components in these sandstones have provided clues of diagenesis.The sandstones at the early stage of diagenesis are characterized by non-ferroan calcite cementation,grain-coating,pore-lining clay minerals,and initial dissolution of detrital grains.Authigenic quartz,porefilling and grain-replacive laumontites,albitized detrital plagioclase,authigenic K-feldspar,illite and late ferroan calcite cement dominate the late diagenesis.reservoir quality is influenced by products of late diagenesis stage,the cement(calcite,albite,quartz,illite,and laumontite)occluded primary and secondary porosity.The organic acidic fluid derived from organic matter in the source rocks during the late diagenesis,which results in the dissolution of detrital plagioclase and laumontite cement and was the main reason for the enhancement of reservoir-quality.As a result of that,the residual primary pore and dissolution pore comprised the main accumulation space for oil and gas,and thus become important targets for hydrocarbon exploration.

关键词： Ordos basin Chang 6 member Diagenesis reservoir-quality Dissolution

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Reconstruction of the diagenesis of the fluvial-lacustrine-deltaic sandstones and its influence on the reservoir quality evolution——Evidence from Jurassic and Triassic sandstones, Yanchang Oil Field, Ordos Basin

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Science China Earth Sciences 2002年第7期45卷 616-634页

作者：罗静兰 S.Morad 张晓莉闫世可武富礼李玉宏薛军民 Key Laboratory for Continental Dynamics Ministry of Education of China Department of Geology Northwest University Xi'an 710069 China

The reservoir quality of Jurassic and Triassic fluvial and lacustrine-deltaic sandstones of the Yanchang Oil Field in the Ordos Basin is strongly influenced by the burial history and facies-related diagenetic events. The fluvial sandstones have a higher average porosity (14.8%) and a higher permeability (12.7×10?3 ?m2) than those of the deltaic sandstones (9.8% and 5.8 ×10?3 ?m2, respectively). The burial compaction, which resulted in 15% and 20% porosity loss for Jurassic and Triassic sandstones, respectively, is the main factor causing the loss of porosity both for the Jurassic and Triassic sandstones. Among the cements, carbonate is the main one that reduced the reservoir quality of the sandstones. The organic acidic fluid derived from organic matter in the source rocks, the inorganic fluid from rock-water reaction during the late diagenesis, and meteoric waters during the epidiagenesis resulted in the formation of dissolution porosity, which is the main reason for the enhancement of reservoir-quality.

关键词： Yanchang Oil Field, Jurassic and Triassic fluvial lacustrine-deltaic sandstone, diagenesis, reservoir-quality evolution.

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