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Stage-progressive distribution pattern of the Lungmachi black graptolitic shales from Guizhou to Chongqing, Central China

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Science China Earth Sciences 2017年第6期60卷 1133-1146页

作者： CHEN Xu FAN JunXuan WANG WenHui WANG HongYan NIE HaiKuan SHI XueWen WEN ZhiDong CHEN DongYang LI WenJie Key Laboratory of Economic Stratigraphy and Palaeogeography Chinese Academy of Sciences Nanjing Institute of Geology and Palaeontology Nanjing 210008 China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China Langfang Branch Research Institute of Petroleum Exploration & Development PetroChina Langfang 065007 China Research Institute of Petroleum Exploration & Development PetroChina Beijing 100083 China Research Institute of Exploration and Development Southwest Oil & Gas Field Company PetroChina Chengdu 610051 China Southern Company of SINOPEC Exploration Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China

The Lungmachi Formation is widely distributed in Guizhou, Chongqing and the adjacent area. It is important for the study of Silurian biostratigraphy and shale-gas investigation. Based on those biostratigraphically well-studied sections from Guiyang to Huayingshan, we reveal the stage-progressive distribution pattern of the Lungmachi black shales. The distribution of the Lungmachi black shales in the studying area can be subdivided into four geographic belts from the south to the north,reflecting the joint effect of regional and global environmental changes. The graptolite depth zonation model was adopted herein to infer the water depth of major graptolite assemblages from the black shales. The changes in the water depth indicate two major stages. The first stage is named the transgressive distribution stage which ranged from the Persculptograptus persculptus biozone(LM1, upper Hirnantian) to the Coronograptus cyphus biozone(LM5, upper Rhuddanian), an interval mostly controlled by global sea-level rise. The second stage, ranging from the Demirastrites triangulatus biozone(LM6, lower Aeronian) to the Spirograptus guerichi biozone(LM9, lower Telychian), is named the regressive shrinking stage, during which the black shales were gradually replaced by mixed-facies or carbonate sediments from the south to the north, representing the effects of the persistent uplifting of the Central Guizhou Oldland.

关键词： Lungmachi Formation Black shales graptolite biozone graptolite depth zonation Transgressive distribution stage Regressive shrinking stage

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Characteristics of shale gas reservoirs in Wufeng Formation and Longmaxi Formation in Well WX2,northeast Chongqing

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Petroleum Research 2017年第4期2卷 324-335页

作者： Jin Wu Feng Liang Wen Lin Hongyan Wang Wenhua Bai Chao Ma Shasha Sun Qun Zhao Xiaojiang Song Rongze Yu PetroChina Research Institute of Petroleum Exploration and Development Langfang 065007China National Energy Shale Gas R&D(Experiment)Centre Hebei 065007China PetroChina Unconventional Oil&Ges Key Laboratory Hebei 065007China

To further understand shale reservoir characteristics of Wufeng Formation and Longmaxi Formation in the Wuxi area,northeast Chongqing,based on drilling data of Well WX2,and taking the graptolite biostratigraphy as the standard marker of stratigraphic division and comparison,the geochemistry,petrology,reservoir space and properties of organic-rich black shale were well investigated,and its gasbearing capacity and controlling factors were also *** result shows that in the Wufeng Formation and Longmaxi Formation of Well WX2,the organic-rich shale is 89.8 m thick and is characterized by good kerogen type,high organic abundance,moderate maturity and favorable hydrocarbongeneration condition,and the graptolite sequence is developed completely and continuously;the organic abundance is influenced by depositional rate,and the slow depositional rate is favorable for accumulation of organic matter in the black graptolite shale;from top to bottom,content of siliceous minerals increases and content of clay minerals decrease,therefore the brittleness increases;the organicrich siliceous shale and clay siliceous shale are favorable lithofacies for development of shale reservoirs;the nanopore is dominated by the parallel-plate pore with four open sides and has good connectivity;the pore size distribution curve has the multimodal characteristic,and the pore diameter mainly is in the range of 0.42e0.62 nm and the range of 3e5 nm;organic pores and interlayer pores of clay minerals make the greatest contribution to the total pore volume,while pores of brittle minerals have the least contribution;from top to bottom,organic pores gradually increase while interlayer pores of clay minerals gradually decrease;the on-site core gas content exceeds 8 m3/t,and the gas-bearing capacity is jointly controlled by hydrocarbon generation,reservoir and preservation conditions;and the WF2-LM6 biozone of the Katian to the early Aeronian is the high-quality shale reservoir,where the LM1 biozone o

关键词： Shale gas reservoirs graptolite biozone Micropore Gas-bearing capacity Wufeng Formation and Longmaxi Formation Northeast Chongqing

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