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Geochemical characteristics of crude oils from Well Zheng-1 in the Junggar Basin, Xinjiang,China

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Chinese Journal Of Geochemistry 2007年第2期26卷 163-169页

作者：李志明张长江秦建中张渠范明刘文斌张志荣 wuxi research institute of Petroleum geology SINOPEC

Well Zheng-1 is located in the combined area of the central uplift and the north Tianshan piedmont depression in the Junggar Basin. Two oil-bearing beds are recognized at 4788–4797 m of the Lower Cretaceous Tugulu Formation (K1tg) and 4808.5–4812.5 m of the Lower Jurassic Sangonghe Formation (J1s). The geochemical characteristics of family composition, carbon isotopic composition, saturated hydrocarbons, sterane and terpane biomarkers and carotane of two crude oils are described in this paper. The results show that the geochemical characteristics of the two crude oils are basically similar to each other, indicating they were all derived mainly from the high mature, brine, algae-rich lake facies sediments. Oil-source correlation revealed that crude oils of the two beds were derived mainly from the source rocks of Permian and mixed by the oil derived from the source rocks of Jurassic and Triassic. This is consistent with the geological background with several sets of source rocks in the area studied.

关键词：新疆准噶尔盆地 Zheng-1井原油地球化学特征

Mesozoic Tectonic Evolution and Thermal History of the Yuanba Area of Northeast Sichuan Basin-Low-Temperature Thermochronology of Apatite and Zircon

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Journal of Earth Science 2013年第4期24卷 599-605页

作者：王杰腾格尔秦建中刘文汇陶成王萍 wuxi institute of Petroleum geology SINOPEC

By means of the vitrinite reflectance and U-Th/He dating of apatite and zircon in cut- ting samples from the T3x-K1j formations in the Yuanba （元坝） area of Northeast Sichuan （四川） Basin, a correlation has been established between the He-derived age and depth/temperature in this area assuming helium closure temperature of apatite in this area being 95 ℃. Mesozoic strata （T3x-Kd＇） experienced helium closure temperature of apatite approaching 95 ℃, but didn＇t reach the helium closure temperature of zircon （ca. 170-190 ℃） although some reached the highest pa- laeogeothermal temperature of about 170 ℃. The Mesozoic strata in the Yuanba area experienced an important uplift and denudation during Paleogene-Neogene periods （0.2-36.4 Ma）, the erosion rate being about 109.9 m/Ma. The K1] Formation and overlying strata experienced a maximum de- nudation loss of about 4 000 m. Geotemperatures gradually fell to the helium closure temperature of apatite and then fell further to the current temperature. The thermal evolution history of this area indicates that the maximum palaeogeothermal temperature of Mesozoic strata was close to 170- 190 ℃, prior to the strata being uplifted. During the period between 176 and 36 Ma, the palaeogeo- thermal temperature fell to 95-170 ℃. and after 36 Ma, it continued to fall to the present geotem- perature of less than 95 ℃.

关键词： vitrinite reflectance U-Th/He dating of apatite and zircon denudation thickness,thermal evolution history Yuanba.

Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application

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Energy Geoscience 2023年第4期4卷 139-148页

作者： Guangzhi Li Guojian Wang Bin Hu Lirong Ning wuxi research institute of Petroleum geology Petroleum Exploration and Production Research InstituteSINOPECWuxiJiangsu214126China

The existence of thermal storage will correspondingly increase the temperature of surrounding strata and promote the continuous expansion,volatilization,upward migration,and loss of gas in the *** a result,a low-concentration gas field will be formed in the strata above geothermal *** reservoirs could in turn heat formation water and increase the solubility of soluble inorganic salts in the surrounding rocks and the total dissolved solids(TDS)content in the formation *** water can strongly wet and permeate strata,the dissolved inorganic salts migrate into upper strata along with water,giving rise to the formation of a high-concentration inorganic salt field in the strata above geothermal reservoirs.A higher geothermal reservoir temperature corresponds to more significant characteristics mentioned ***,a medium-to-high temperature geothermal system has a surface geochemical anomaly pattern of high inorganic salt concentrations and low gas concentrations(also referred to as the high-salt and low-gas pattern).This pattern is applied to the surface geochemical exploration of the two geothermal fields in Guangdong Province,i.e.,the Huangshadong geothermal field in Huizhou City and the Xinzhou geothermal field in Yangjiang City,revealing low-concentration gas fields above *** application results also show that the exposed thermal spring water in both geological fields has higher concentration of dissolved inorganic salt than the surface water and nearby seawater,forming high-amplitude anomalies on the surface above geothermal *** characteristics,as well as the measured temperature at known geothermal wells,verify the validity of the high-salt and low-gas pattern of medium-to-high temperature geothermal systems proposed in this ***,the high-salt and low-gas pattern proposed predicts three favorable medium-to-high temperature geothermal zones in the surface geochemical exploration of the Shiba Basin nea

关键词： Medium-to-high temperature Geothermal field Geochemical exploration Anomaly pattern

Formation Mechanism of High Quality Marine Source Rocks-Coupled Control Mechanism of Geological Environment and Organism Evolution

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Journal of Earth Science 2011年第3期22卷 326-339页

作者：腾格尔胡凯孟庆强黄娟付小东谢小敏仰云峰高长林 wuxi research institute of Petroleum geology SINOPEC Department of Earth Sciences Nanjing University

High quality marine source rock （HQMSR） is the key prerequisite for medium to large hydrocarbon accumulations. However, the forming mechanism remains unclear. On the basis of the in-vestigation for the geodynamic setting of the Middle-Upper Yangtze during the Early Cambrian in dif-ferent spatial scales and the analysis of trace elements, the main controlling factors of the development of high quality marine source rock are discussed, with specific consideration of the burial rate of the organic matter. The formation of high quality marine source rocks is suggested to be the result of a co-ordinated development and the interaction between geological environments and organism evolution during the major geological transition periods. We perceived that the burial rate of organic matter was influenced by the primary productivity and its burial conditions. The abundance of autogenetic molyb-denum gained directly by the chemical speciation analysis of rocks could be used as a proxy for the burial organic matter. The burial rate of autogenetic molybdenum and the sedimentary organics in modern marine environments could be used to estimate the sedimentary organics in ancient environ-ments effectively.

关键词： high quality marine source rock forming mechanism geodynamics geological envi-ronment organic evolution speciation analysis.

Early dolomitisation of the Lower-Middle Ordovician cyclic carbonates in northern Tarim Basin, NW China

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Science China Earth Sciences 2017年第7期60卷 1283-1298页

作者： GUO Chuan CHEN DaiZhao DONG ShaoFeng QIAN YiXiong LIU CunGe Key Laboratory of Petroleum Resources research Institute of Geology and Geophysics Chinese Academy of Sciences wuxi research institute Petroleum geology SINOPEC College of Petroleum Engineering Guangdong University of Petrochemical Technology

High-frequency metre-scale cycles are present within the Lower-Middle Ordovician carbonate successions in northern Tarim Basin, NW China. These metre-scale cycles were variably dolomitised from top to bottom. Three types of replacive dolomites were recognised, including dololaminite(very finely to finely crystalline, planar-s to nonplanar-a dolomite;type-1), patterned dolomite(finely crystalline, planar-s dolomite; type-2), and mottled dolomite(finely to medium crystalline,nonplanar-a(s) dolomite; type-3). Petrographic evidence indicate these dolomites were primarily deposited in supratidal to restricted subtidal environments, and formed in near-surface to shallow burial realms. Geochemically, all types of dolomites have similar δ13C and 87Sr/86 Sr ratios comparable to calcite precipitated in equilibrium with the Early-Middle Ordovician seawater. These geochemical attributes indicate that these dolomites were genetically associated and likely formed from connate seawater-derived brines. Of these, type-1 dolomite has δ18O values(.4.97‰ to.4.04‰ VPDB) slightly higher than those of normal seawater dolomite of the Early-Middle Ordovician age. Considering the absence of associated evaporites within type-1 dolomite, its parental fluids were likely represented by slightly evaporated(i.e., mesosaline to penesaline) seawater with salinity below that of gypsum precipitation. More depleted δ18O values(.7.74‰ to.5.20‰ VPDB) of type-2 dolomite and its stratigraphic position below type-1 dolomite indicate the generation of this dolomite from mesosaline to penesaline brines at higher temperatures in near-surface to shallow burial domains. Type-3 dolomite yields the most depleted δ18O values(–9.30‰to –7.28‰ VPDB), pointing to that it was most likely formed from coeval seawater-derived brines at highest temperatures in a shallow burial setting. There is a downward decreasing trend in δ18O values from type-1 through type-2 to type-3 dolomites, and in abundance of dolomites, indicatin

关键词： Early dolomitisation Cyclicity Carbonate Lower-Middle Ordovician Tarim Basin

An isotope study of the accumulation mechanisms of high-sulfur gas from the Sichuan Basin, southwestern China

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Science China Earth Sciences 2016年第11期59卷 2142-2154页

作者： LIU WenHui Tenger ZHANG ZhongNing LUO HouYong ZHANG DianWei WANG Jie LI LiWu GAO Bo LU LongFei ZHAO Heng Sinopec Petroleum Exploration & Production research institute Beijing 100083 China Key Laboratory of Petroleum Accumulation Mechanisms SINOPEC Wuxi 214151 China wuxi research institute of Petroleum geology Sinopec Petroleum Exploration & Production Research Institute Wuxi 214151 China Lanzhou Center for Oil and Gas Resources Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou 730000 China

The mechanism of hydrogen sulfide(H_2S) generation plays a key role in the exploration and development of marine high-sulfur natural gas, of which the major targets are the composition and isotope characteristics of sulfur-containing *** source rocks, reservoir rocks, natural gases and water-soluble gases from Sichuan Basin have been analyzed with an online method for the content of H_2S and isotopic composition of different sulfur-containing compounds. The results of comparative analysis show that the sulfur-containing compounds in the source rocks are mainly formed by bacterial sulfate reduction(BSR), and the sulfur compounds in natural gas, water and reservoir are mainly formed by thermal sulfate reduction(TSR). Moreover, it has been shown that the isotopically reversion for methane and ethane in high sulfur content gas is caused by TSR. The sulfur isotopic composition of H_2S in natural gas is inherited from the gypsum or brine of the same or adjacent layer,indicating that the generation and accumulation of H_2S have the characteristics of either a self-generated source or a near-source.

关键词： H_2S TSR Sulfur-containing natural gas Sulfur isotope Hydrocarbon accumulation mechanism Sichuan Basin

Geochemical characteristics of the Permian Changxing Formation reef dolomites,northeastern Sichuan Basin,China

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Petroleum Science 2013年第1期10卷 38-49页

作者： Hu Zuowei Huang Sijing Li Zhiming Zhang Yingying Xu Ershe Qi Shichao State Key Laboratory of Oil/Gas Reservoir geology and Exploitation Institute of Sedimentary GeologyChengdu University of Technology wuxi research institute of Petroleum geology SINOPEC Exploration&Production Institute

The recent discovery of deep and ultra-deep gas reservoirs in the Permian Changxing Formation reefs, northeastern Sichuan Basin is a significant development in marine carbonate oil ＆ gas exploration in China. Reef dolomites and their origins have been major research topics for sedimentologists and oil ＆ gas geologists. The petrography, trace element and isotope geochemistry of the reef dolomites indicated that the dolomites are characterized by low Sr and Mn contents, relatively low Fe contents, very similar δ13C and 6180 values and very different 87Sr/86Sr ratios. Although the calculated results of the fluid mixing suggested that a mixture with 85%-95% meteoric water and 50/o- 15% seawater seemed to be the dolomitizing fluids of the reef dolomites, the low Mn contents, relatively low Fe contents, high δ13c values and high homogenization temperatures of the dolomites did not support that there were large proportions of meteoric water in the dolomitization process, and the 87Sr/86Sr ratios which were close to coeval seawater also did not support the possibility of the mixture of deep-burial circulated fluids from clastic rocks. High temperature deep-burial circulated seawater with low Mn and Fe contents, high Sr content and high δ13C values from the dissolution of widely distributed Triassic evaporites during the burial diagenetic processes （including dehydration of water-bearing evaporites） could have been the dolomitizing fluids of the reef dolomites.

关键词： Permian Changxing Formation dolomite reef geochemistry northeastern Sichuan Basin

Features and Controlling Factors of Epigenic Karstification of the Ordovician Carbonates in Akekule Arch,Tarim Basin

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Journal of Earth Science 2012年第4期23卷 506-515页

作者：陈强路赵永强李国蓉储呈林王斌 wuxi research institute of Petroleum geology SINOPEC State Key Laboratory of Oil and Gas Reservoir geology and Exploitation Chengdu University of Technology

ABSTRACT： Tabei （塔北） uplift is an area with the highest hydrocarbon enrichment in Tarim basin, and large oilfields have been found on Akekule （阿克库勒） arch at the middle section of Tabei uplift, with Ordovician carbonate reservoirs. Storage space of the Ordovician carbonate reservoirs in the Akekule arch are mainly caves, pores and fractures resulted from dissolution and/or karstification. The Ordovician carbonate reservoirs are affected and modified by the diagenetie process in penecontemporaneous, epigenetic and burial periods and the multi-stage karstification related with deep hydrothermal activities, among which the most significant effect is from the meteoric water karstification related to the tectonic uplift from the end of Middle Ordovician to the end of Late Ordovician （end of O2-end of 03） and at the end of Middle Devonian （end of D2）. Varied palacogeologic settings and tectonic features at different geologic periods lead to different fluid flowing patterns, karstification mechanisms and transformation features in different regions, which further influence the reservoir distribution. The paleo-uplifts at different periods, such as end of O2-end of 03 and end of D2, control the dominant development zones of karstification; the paleogeomorphology and faults resulted from tectonic uplift control the flowing depth of the karst fluid; and the lithology controls the position and extent of karst development.

关键词： epigenic karstification carbonate rock Ordovician controlling factor Akekule arch,Tarim basin.

The source and formation characteristics of the Zhujiadun gas reservoirs in the Yancheng Sag, Subei Basin

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Energy Geoscience 2023年第3期4卷 90-99页

作者： Jinning Peng Xu Liu Wenlei Pan Haihua Li Jianhua Qiu SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms Wuxi214126China wuxi research institute of Petroleum geology SINOPECWuxi214126China

The Yancheng Sag is a favorable exploration area in the Subei Basin. However, the key geological understanding of the natural gas source and reservoir formation characteristics of the sag is still controversial. Based on a set of organic geochemical experiments conducted on natural gas and associated condensate oil of the first member of the Funing Formation (E1f1) in well YCh5 and well data analysis, the oil-gas resources and reservoir formation model in the Zhujiadun gas reservoir in the Yancheng Sag, Subei Basin, were investigated. The results of this study are as follows. (1) The natural gas in the Zhujiadun gas reservoir is dry gas with high methane content, low heavy hydrocarbon content, and high maturity. The characteristics of carbon and hydrogen isotopes in the natural gas indicate that the natural gas is oil-cracked gas, which mainly originates from the source rocks of the Permian Qixia Formation. (2) The condensate oil from well YCh5 with a high degree of maturity has a high pristane/phytane ratio, low gamma-paraffin abundance, and low tricyclic terpene abundance, indicating a mixture of the Upper Paleozoic condensate oil and Cenozoic crude oil. The saturated and aromatic hydrocarbons have similar δ13C values to the Cenozoic continental crude oil. These features suggest two sources of condensate oil. (3) Oils generated from the source rocks of the Qixia Formation were cracked into highly mature gas after deep burial, which migrated along large faults into the sandstones of the E1f1 and K1t1 members. This type of reservoir was effectively preserved beneath the overlying mudstone cap rocks. Therefore, it can be inferred that a play fairway might occur in the eastern zone of the faults connected to the Paleozoic source rocks in the Yancheng Sag since this zone has similar petroleum geological conditions to well YCh5. Therefore, this zone is a favorable area for further exploration.

关键词： Genesis of natural gas Geochemical characteristics Reservoir formation model Yancheng Sag Subei Basin