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- 저자 : Xianzhi Gao (검색결과 2 건)
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Fugui He,Xianzhi Gao,Xianzheng Zhao,Huilai Wang,Dexiang Yang,Quan Wang 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.4
The Bayindulan Sag situated in Erlian Basin, northeast China, is characterized by pervasive dolomitization in Upper A4 Member to Lower T1 Member of Bayanhua Group. These stratum in the Lower Cretaceous Bayanhua Group were deposited in a lacustrine environments. The main objective of this study is to identify the origin of dolomitization and distribution model of dolomitized rocks. Based on petrographic examination, mud-crystal dolomites (<0.03 mm), silt-crystal dolomites (0.03–0.1 mm) and fine-crystal dolomites (0.1– 0.25 mm) have been observed, and the former two types were predominant. Meanwhile, only one type of dolomite have been defined: replacive dolomite. A variety of dolomite textures have also been observed, the major ones of them are scattered, blocky, joined and annular textures. These dolomites have strongly depleted oxygen isotopic values from –17.48‰ to –6.96‰ with the average of –10.48‰ (PDB), carbon isotopic values from 0.24‰ to 8.37‰ with the average of 5.39‰ (PDB). The obvious depletion of oxygen isotopic was presented as a result of the increase in temperature with progressive burial, and the high carbon isotopic content of dolomites maybe result from the involvement of CO2 in the dolomitization process. These CO2 were generated by bio-methanation which commonly took place in moderately deep burial environments. The Sr values from 62.4 ppm to 262 ppm as well as the Sr/Ba ratios from 0.24 to 0.76 in Tengyi Formation mudstones indicate the freshwater lacustrine sedimentary environments. Taking the petrographic and geochemical data into consideration, the conclusion that the dolomites have formed in a freshwater environments during deep burial depths at temperatures of at least 60 °C can be drawn. Petrographic observations and mineralogy analyses indicate that dolomitization is closely associated with tuffaceous materials, the Mg needed for the dolomitization is provided by dissolution of tuffaceous materials and dolomitization is most probably driven by tuffaceous materials alteration at elevated temperatures.
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Changqing Ren,Fugui He,Xianzhi Gao,Dongsheng Wu,Wenli Yao,Jianzhang Tian,Huiping Guo,Yuanxin Huang,Li Wang,Han Feng,Junwei Li 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.6
The Shulu Sag which is a rifted sag with NNE trend is located in the south of Jizhong Depression, Bohai Bay Basin, northern China. The gentle slope and three troughs are situated in the west and east of the sag, respectively. Both of the lower part of Shasan Member (Es3x) and the lower part of Shayi Member (Es1x) act as source rocks in this sag. Researches on the type, quantity, quality and thermal maturity of the respective organic matter have been conducted using Rock-Eval pyrolysis data. Type II is the dominant kerogen in Es1x of all troughs. However, Type II1 and III is the dominant kerogen in Es3x of Middle-Southern and Northern trough, respectively. TOC (total organic carbon) and pyrolysis S2 (hydrocarbon) values suggest that the Es1x source rocks in Middle-Southern and Northern trough are fair to good and poor to fair generative potential of hydrocarbon, separately. The Es3x source rocks in Middle-Southern and Northern trough possess fair to excellent and poor to fair generative potential of hydrocarbon, individually. Tmax (pyrolysis temperature at maximum S2) values indicate that most of Es3x samples are thermally mature, but all Es1x samples are thermally immature. Under large scale condition, the hydrocarbon secondary migration in the upper part of Shasan Member (Es3s), Shaer Member (Es2) and the upper part of Shayi Member (Es1s) have been simulated using fluid potential model with Arcgis 9.3 software. The simulation results reveal the direction of hydrocarbon secondary migration and the distribution of hydrocarbon migration-accumulation units (HMAUS), and also suggest that the hydrocarbon migration direction is obviously controlled by nose-like structure belts where most of hydrocarbons accumulate. That shows high reliability because they are consistent with the hydrocarbon exploration result in this area. On the basis of integrated analyses of source rocks and hydrocarbon migration direction, the following five areas in the gentle slope are identified to be the preferred hydrocarbon accumulation area: Taijiazhuang area, northern and southern Xicaogu area, as well as northern and southern Leijiazhuang area. It is considerably helpful to reduce the risk in hydrocarbon exploration of Shulu Sag.
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