| Citation: |
Yun-qian Lu, You-lu Jiang, Wei Wang, Jian-feng Du, Jing-dong Liu, 2020. Coupling relationship between reservoir diagenesis and hydrocarbon accumulation in Lower Cretaceous Yingcheng Formation of Dongling, Changling fault depression, Songliao Basin, Northeast China, China Geology, 3, 247-261. doi: 10.31035/cg2020004
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Coupling relationship between reservoir diagenesis and hydrocarbon accumulation in Lower Cretaceous Yingcheng Formation of Dongling, Changling fault depression, Songliao Basin, Northeast China
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Abstract
The Lower Cretaceous Yingcheng Formation in the southern Songliao Basin is the typical tight oil sandstone in China. In order to better predict the petrophysical properties of the tight sandstone reservoirs in the Lower Cretaceous Yingcheng Formation, Songliao Basin, Northeast China, the diagenesis and porosity evolution was investigated using a suite of petrographic and geochemical techniques including thin section analysis, scanning electron microscopy, mercury intrusion and fluid inclusion analysis, on a set of selected tight sandstone samples. Combined with the histories of burial evolution, organic matter thermal evolution and hydrocarbon charge, the matching relationship between reservoir porosity evolution and hydrocarbon accumulation history is analyzed. The result showed that the tight sandstone reservoirs characterized of being controlled by deposition, predominated by compaction, improved by dissolution and enhanced by cementation. The hydrocarbon accumulation period was investigated using a suite of hydrocarbon generation and expulsion history, microfluorescence determination and temperature measurement technology. According to the homogenization temperature of the inclusions and the history of burial evolution, Yingcheng Formation has mainly two phases hydrocarbon accumulation. The first phase of oil and gas is charged before the reservoir is tightened, the oil and gas generated by Shahezi source rocks enter the sand body of Yingcheng Formation, influenced by the carrying capability of sand conducting layer, oil and gas is mainly conducted by the better properties and higher connectivity sand body and enriched in the east, which belongs to the type of densification after hydrocarbon accumulation. The second phase of oil and gas charge after densification, which belongs to the type of densification before the hydrocarbon accumulation.
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References
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Yun-qian Lu, You-lu Jiang, Wei Wang, Jian-feng Du, Jing-dong Liu, 2020. Coupling relationship between reservoir diagenesis and hydrocarbon accumulation in Lower Cretaceous Yingcheng Formation of Dongling, Changling fault depression, Songliao Basin, Northeast China, China Geology, 3, 247-261. doi: 10.31035/cg2020004
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Figure 1.
Structural map of the Dongling sags.
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Figure 2.
Characteristics of the Yingcheng Formation reservoirs in Lower Cretaceous in Dongling area. a–classification of sandstone using Folk RL’s (1974) criteria; b–porosity distribution characteristics of the Yingcheng Formation tight sandstone reservoirs; c–permeability distribution characteristics of the Yingcheng Formation tight sandstone reservoirs.
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Figure 3.
Microscopic characteristics in the Lower Cretaceous Yingcheng Formation sandstone reservoirs of Dongling. a–photomicrograph of thin section showing detrital grains close contact; b– photomicrograph of thin section showing quartz overgrowth; c–photomicrograph thin section showing of calcite cement in close contact with detrital grains; d–photomicrograph of thin section showing calcite metasomatism feldspar; e–photomicrograph of thin section showing dolomite cement in close contact with detrital grains; f–photomicrograph of thin section showing quartz overgrowth and related feldspar dissolution; g–photomicrograph of thin section showing feldspar dissolution; h–MAPS minerology image showing feldspar kaolinization; i–MAPS minerology image showing quartz with illite and smectite. CC–carbonate cements; Ca–calcite; Qo–quartz overgrowth; Fl-D–feldspar dissolution; Ka– kaolinization; I/S–illite and smectite.
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Figure 4.
Fluid inclusion occurrences of Yingcheng Formation in Dongling area. a–oil inclusions along microfracture in quartz grain, which fluoresce yellow; b–oil inclusions along microfracture in quartz grain, which fluoresce yellow-green; c–oil inclusions along microfracture in quartz grain, which fluoresce yellow-green; d–oil inclusions along microfracture in quartz grain, which fluoresce yellow-green; e–oil inclusions at quartz overgrowth, which fluoresce blue-green; f–oil inclusions at quartz overgrowth, which fluoresce yellow-green; g–oil inclusions in cross-cutting trail, which fluoresce blue-white; h–oil inclusions in cross-cutting trail, which fluoresce blue-white; i–oil inclusions in cross-cutting trail, which fluoresce blue-white; j–oil inclusions in cross-cutting trail, which fluoresce blue-white; k–oil inclusions at calcite cement, which fluoresce blue-white; l–gas inclusions in cross-cutting trail, which have no fluoresce.
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Figure 5.
Salinities and homogenized temperatures of the hydrocarbon coeval aqueous inclusions of Yingcheng Formation.
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Figure 6.
Diagenetic evolution sequence of Dongling area.
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Figure 7.
Using diagenetic sequence and burial history to determine the periods of inclusions.
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Figure 8.
The microscopic characteristics of the SN187 in 2263.7 m of Yingcheng Formation.
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Figure 9.
The reservoir pore evolution curve of SN187 in 2263.7 m of Yingcheng Formation.
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Figure 10.
Hydrocarbon-generating history of Shahezi source rocks of S11 in Dongling area.
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Figure 11.
Burial history of SN187 of Yingcheng Formation of Dongling area.
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Figure 12.
Coupling relationship between diagenetic evolution and oil and gas accumulation of Yingcheng Formation in Dongling area.