The Es3/3-Es1/4 shales in Dongying sag are source rocks with large reserves of shale oil and gas. For the iden- tification of development characteristics and geological significance of the reservoir space, FM1 logging...The Es3/3-Es1/4 shales in Dongying sag are source rocks with large reserves of shale oil and gas. For the iden- tification of development characteristics and geological significance of the reservoir space, FM1 logging, core observation, thin section analysis, X-ray diffraction, fluorescence microscopy, scanning electron microscopy, mercury porosimetry, low-temperature nitrogen adsorption, atomic force microscopy, and conventional physical property testing were used to study the petrology and reservoir space of the Es3/3-Es1/4 shale in Dongying sag. The results suggest that the shale is rich in carbonate minerals. Phanero- crystalline stratiform and lamellar argillaceous limestone and calcareous claystone are the oil- and gas-bearing lithofacies. The oil in the micropores is mainly present as membranes and clots. The shale reservoir space has a network structure with veins, carbonate and clay minerals, and micropores among pyrite and the matrix. The results provide the geological framework for future shale oil and gas explora- tion in Dongying sag.展开更多
Distribution characteristics,organic matter development characteristics,gas-bearing characteristics,reservoir characteristics,and preservation conditions of the Shahezi Formation shale of Lower Cretaceous in the Lishu...Distribution characteristics,organic matter development characteristics,gas-bearing characteristics,reservoir characteristics,and preservation conditions of the Shahezi Formation shale of Lower Cretaceous in the Lishu fault depression,Songliao Basin,NE China,are analyzed using organic geochemical,whole rock,and SEM analysis data,and CO_(2)and N_(2) adsorption and high-pressure mercury injection experiment data in combination with the tectonic and sedimentation evolution of the region to reveal the geological conditions for enrichment and resource potential of continental shale gas.The organic-rich shale in the Lower Cretaceous of the Lishu fault depression is mainly developed in the lower submember of the second member of the Shahezi Formation(K_(1)sh_(2)^(1) Fm.)and is thick and stable in distribution.The shale has high TOC,mainly types II_(1) and II_(2) organic matter,and is in the mature to the over-mature stage.The volcanic activity,salinization,and reduction of the water environment are conducive to the formation of the organic-rich shale.The shale reservoirs have mainly clay mineral intergranular pores,organic matter pores,carbonate mineral dissolution pores,and foliated microfractures as storage space.The pores are in the mesopore range of 10–50 nm,and the microfractures are mostly 5–10μm wide.Massive argillaceous rocks of lowland and highstand domains are deposited above and below the gas-bearing shale separately in the lower submember of the K_(1)sh_(2)^(1) Fm.,act as the natural roof and floor in the process of shale gas accumulation and preservation,and control the shale gas enrichment.Based on the above understandings,the first shale gas exploration well in Shahezi Formation was drilled in the Lishu fault depression of Songliao Basin.After fracturing,the well tested a daily gas production of 7.6×10^(4) m^(3),marking a breakthrough in continental shale gas exploration in the Shahezi Formation(K1 sh Fm.)of the Lishu fault depression in Songliao Basin.The exploration practice has reference significance for the exploration of continental shale gas in the Lower Cretaceous of Songliao Basin and its periphery.展开更多
储层的微观孔隙结构特征是评价页岩储层储集性能、资源丰度和“甜点”的重要因素。针对松辽盆地南部大安地区青一段页岩微观孔隙结构特征不明确的问题,利用氩离子剖光—扫描电镜、高压压汞、恒速压汞、CT扫描和核磁共振等测试方法,联合...储层的微观孔隙结构特征是评价页岩储层储集性能、资源丰度和“甜点”的重要因素。针对松辽盆地南部大安地区青一段页岩微观孔隙结构特征不明确的问题,利用氩离子剖光—扫描电镜、高压压汞、恒速压汞、CT扫描和核磁共振等测试方法,联合表征研究区青一段页岩储层储集空间类型、孔喉半径分布、连通性及流体可动性特征。研究结果表明:大安地区青一段页岩储层属于黏土质页岩相及混合质页岩相,平均孔隙度为5.95%,平均渗透率为0.0416 mD,属于特低孔超低渗、超低孔超低渗致密型及超致密型储集空间。划分出8种储集空间类型,微裂缝、喉道连通了储集空间,改善了储层物性,储层可动流体百分比为27%~47%。结合储层含油性特征,预测研究区I类有利储层面积约为300 km 2,Ⅱ类有利储层面积约为650 km 2,具有良好的勘探开发前景。研究成果可为研究区页岩储层微观孔隙结构评价提供技术支撑。展开更多
基金funded by the Scientific and Technological Brainstorm Project of Sinopec Corp (No. P12062)
文摘The Es3/3-Es1/4 shales in Dongying sag are source rocks with large reserves of shale oil and gas. For the iden- tification of development characteristics and geological significance of the reservoir space, FM1 logging, core observation, thin section analysis, X-ray diffraction, fluorescence microscopy, scanning electron microscopy, mercury porosimetry, low-temperature nitrogen adsorption, atomic force microscopy, and conventional physical property testing were used to study the petrology and reservoir space of the Es3/3-Es1/4 shale in Dongying sag. The results suggest that the shale is rich in carbonate minerals. Phanero- crystalline stratiform and lamellar argillaceous limestone and calcareous claystone are the oil- and gas-bearing lithofacies. The oil in the micropores is mainly present as membranes and clots. The shale reservoir space has a network structure with veins, carbonate and clay minerals, and micropores among pyrite and the matrix. The results provide the geological framework for future shale oil and gas explora- tion in Dongying sag.
基金Supported by China Geological Survey projects(DD20190115,DD20160202)。
文摘Distribution characteristics,organic matter development characteristics,gas-bearing characteristics,reservoir characteristics,and preservation conditions of the Shahezi Formation shale of Lower Cretaceous in the Lishu fault depression,Songliao Basin,NE China,are analyzed using organic geochemical,whole rock,and SEM analysis data,and CO_(2)and N_(2) adsorption and high-pressure mercury injection experiment data in combination with the tectonic and sedimentation evolution of the region to reveal the geological conditions for enrichment and resource potential of continental shale gas.The organic-rich shale in the Lower Cretaceous of the Lishu fault depression is mainly developed in the lower submember of the second member of the Shahezi Formation(K_(1)sh_(2)^(1) Fm.)and is thick and stable in distribution.The shale has high TOC,mainly types II_(1) and II_(2) organic matter,and is in the mature to the over-mature stage.The volcanic activity,salinization,and reduction of the water environment are conducive to the formation of the organic-rich shale.The shale reservoirs have mainly clay mineral intergranular pores,organic matter pores,carbonate mineral dissolution pores,and foliated microfractures as storage space.The pores are in the mesopore range of 10–50 nm,and the microfractures are mostly 5–10μm wide.Massive argillaceous rocks of lowland and highstand domains are deposited above and below the gas-bearing shale separately in the lower submember of the K_(1)sh_(2)^(1) Fm.,act as the natural roof and floor in the process of shale gas accumulation and preservation,and control the shale gas enrichment.Based on the above understandings,the first shale gas exploration well in Shahezi Formation was drilled in the Lishu fault depression of Songliao Basin.After fracturing,the well tested a daily gas production of 7.6×10^(4) m^(3),marking a breakthrough in continental shale gas exploration in the Shahezi Formation(K1 sh Fm.)of the Lishu fault depression in Songliao Basin.The exploration practice has reference significance for the exploration of continental shale gas in the Lower Cretaceous of Songliao Basin and its periphery.
文摘储层的微观孔隙结构特征是评价页岩储层储集性能、资源丰度和“甜点”的重要因素。针对松辽盆地南部大安地区青一段页岩微观孔隙结构特征不明确的问题,利用氩离子剖光—扫描电镜、高压压汞、恒速压汞、CT扫描和核磁共振等测试方法,联合表征研究区青一段页岩储层储集空间类型、孔喉半径分布、连通性及流体可动性特征。研究结果表明:大安地区青一段页岩储层属于黏土质页岩相及混合质页岩相,平均孔隙度为5.95%,平均渗透率为0.0416 mD,属于特低孔超低渗、超低孔超低渗致密型及超致密型储集空间。划分出8种储集空间类型,微裂缝、喉道连通了储集空间,改善了储层物性,储层可动流体百分比为27%~47%。结合储层含油性特征,预测研究区I类有利储层面积约为300 km 2,Ⅱ类有利储层面积约为650 km 2,具有良好的勘探开发前景。研究成果可为研究区页岩储层微观孔隙结构评价提供技术支撑。
