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Reservoir Characteristics of Fine-grained Sedimentary Rocks in Saline Lakes in the Cenozoic Upper Ganchaigou Formation, Southwestern Qaidam Basin, NW China
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-05-31 , DOI: 10.1111/1755-6724.14725 Jun SHENG 1 , Jincheng LIU 1 , Yunlong LI 2 , Haiyan ZOU 1 , Anlin LONG 1 , Lin WANG 1 , Jiyong LI 1 , Qingshan QI 1 , Xiaojing YANG 3 , Yanan LI 1
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-05-31 , DOI: 10.1111/1755-6724.14725 Jun SHENG 1 , Jincheng LIU 1 , Yunlong LI 2 , Haiyan ZOU 1 , Anlin LONG 1 , Lin WANG 1 , Jiyong LI 1 , Qingshan QI 1 , Xiaojing YANG 3 , Yanan LI 1
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Cenozoic fine-grained sedimentary rocks in the southwestern Qaidam Basin, as typical salinized lacustrine sediments, are significantly different from those in other freshwater lakes under the impact of the high salinity in the lake. Many fine-grained sedimentary rock samples were selected from the lower member of Neogene (N1) in the Gaskule Oilfield, Qaidam Basin, northwest China, with the aim to analyze and test their petrology, pore structure, and organic geochemical characteristics and determine its genesis and geological significance. Based on previous results, a new genesis of mixed sedimentary rocks is proposed. The Cenozoic lacustrine fine-grained sedimentary rocks in SW Qaidam Basin belong to mixed sedimentary rocks, which can be divided into three types, including carbonate and terrigenous clastic-bearing mudstone, carbonate-bearing to terrigenous clastic mixed sedimentary rocks, and carbonate-terrigenous clastic mixed sedimentary rocks. The geneses of mixing are quite different from that of mixed marine rocks. According to the sedimentary characteristics of the salinized lakes, three new geneses of mixed deposits are proposed: syn-sedimentary mixing, varve interbedded mixing, and biogenic mixing. The reservoir spaces of the Cenozoic lacustrine fine-grained sedimentary rocks in SW Qaidam Basin include residual intergranular pores, intercrystalline pores, microfractures, and minor dissolved pores. The reservoirs have super-low porosity and ultra-low permeability, with a porosity of 1.82%–21.04%, averaging 7.71%, and permeability of (0.0028–254.86) × 10–3 μm2, averaging 2.82 × 10–3 μm2. The test results of total organic carbon (TOC) content show that the highest content of organic carbon reached 1.41%, and those of vitrinite reflectance show that Ro ranges from 0.525%–0.824%, with an average of 0.806%. The organic geochemical characteristics show that the fine-grained mixed sedimentary rocks of SW Qaidam Basin have the potential for self-generation and self-storage. As an unconventional reservoir, it has potential industrial value. This is the first study of fine-grained sedimentary rocks in the Qaidam Basin, which offers certain theoretical and practical values.
中文翻译：
柴西南新生代上干柴沟组盐湖细粒沉积岩储层特征
柴达木盆地西南部新生代细粒沉积岩作为典型的盐渍化湖相沉积物，在湖内高盐度的影响下，与其他淡水湖的沉积岩存在显着差异。许多细粒沉积岩样品选自新近纪下段（N 1) 在柴达木盆地加斯库勒油田，旨在分析和测试其岩石学、孔隙结构和有机地球化学特征，确定其成因和地质意义。在前人研究成果的基础上，提出了一种新的混合沉积岩成因。柴达木盆地新生代湖相细粒沉积岩属于混合沉积岩，可分为碳酸盐-陆源碎屑泥岩、碳酸盐-陆源碎屑混合沉积岩、碳酸盐-陆源碎屑岩三种类型。混合沉积岩。混合的成因与混合的海相岩石有很大的不同。根据盐化湖泊的沉积特征，提出了三种混合沉积新成因：同沉积混合、varve 夹层混合和生物源混合。柴达木盆地新生代湖相细粒沉积岩储集空间包括残余粒间孔、晶间孔、微裂缝和微小溶蚀孔。储集层为超低孔、超低渗，孔隙度1.82%～21.04%，平均7.71%，渗透率（0.0028～254.86）×10–3 μm 2，平均为 2.82 × 10 –3 μm 2。总有机碳（TOC）含量测试结果表明，有机碳含量最高达到1.41%，镜质体反射率测试结果表明，R o 范围为0.525%~0.824%，平均为0.806%。有机地球化学特征表明，柴达木盆地细粒混合沉积岩具有自生自储潜力。作为非常规油气藏，具有潜在的工业价值。这是柴达木盆地细粒沉积岩的首次研究，具有一定的理论和实践价值。
更新日期：2021-05-31
中文翻译：
柴西南新生代上干柴沟组盐湖细粒沉积岩储层特征
柴达木盆地西南部新生代细粒沉积岩作为典型的盐渍化湖相沉积物，在湖内高盐度的影响下，与其他淡水湖的沉积岩存在显着差异。许多细粒沉积岩样品选自新近纪下段（N 1) 在柴达木盆地加斯库勒油田，旨在分析和测试其岩石学、孔隙结构和有机地球化学特征，确定其成因和地质意义。在前人研究成果的基础上，提出了一种新的混合沉积岩成因。柴达木盆地新生代湖相细粒沉积岩属于混合沉积岩，可分为碳酸盐-陆源碎屑泥岩、碳酸盐-陆源碎屑混合沉积岩、碳酸盐-陆源碎屑岩三种类型。混合沉积岩。混合的成因与混合的海相岩石有很大的不同。根据盐化湖泊的沉积特征，提出了三种混合沉积新成因：同沉积混合、varve 夹层混合和生物源混合。柴达木盆地新生代湖相细粒沉积岩储集空间包括残余粒间孔、晶间孔、微裂缝和微小溶蚀孔。储集层为超低孔、超低渗，孔隙度1.82%～21.04%，平均7.71%，渗透率（0.0028～254.86）×10–3 μm 2，平均为 2.82 × 10 –3 μm 2。总有机碳（TOC）含量测试结果表明，有机碳含量最高达到1.41%，镜质体反射率测试结果表明，R o 范围为0.525%~0.824%，平均为0.806%。有机地球化学特征表明，柴达木盆地细粒混合沉积岩具有自生自储潜力。作为非常规油气藏，具有潜在的工业价值。这是柴达木盆地细粒沉积岩的首次研究，具有一定的理论和实践价值。
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