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diagenetic fluids evolution and genetic mechanism of tight sandstone gas reservoirs in Upper Triassic Xujiahe Formation in Sichuan Basin, China

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Science China Earth Sciences 2008年第9期51卷 1340-1353页

作者： ZHU RuKai ZOU CaiNeng ZHANG Nai WANG XueSong CHENG Rong LIU LiuHong ZHOU ChuanMin SONG LiHong Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China PetroChina Southwest Oil&Gas Field Company Luzhou 646001China

The reservoirs of the Upper Triassic Xujiahe Formation in Sichuan Basin have the characteristics of low compositional maturity, low contents of cements and medium textural maturity. The general physical properties of the reservoirs are poor, with low porosity and low permeability, and there are only a few reservoirs with medium porosity and low permeability in local areas. Based on the diagenetic mineral association, a diagenetic sequence of cements is established: early calcites (or micrite siderites) →first quartz overgrowth→chlorite coatings→dissolution of feldspars and debris→chlorite linings→ second quartz overgrowth (quartz widen or filled in remain intergranular pores and solution pores)→dissolution→third quartz overgrowth (quartz filled in intergranular and intragranular solution pores)→intergrowth (ferro) calcites→dolomites→ferro (calcites) dolomites→later dissolution→veins of quartz and calcites formation. Mechanical compaction is the main factor in making the reservoirs tight in the basin, followed by the second and third quartz overgrowth. In a long-term closed system, only feld-spars and some lithic fragments are dissolved by diagenetic fluids, while intergranular cements such as quartz and calcit are not dissolved and thus have little influence on the porosity of the Xujiahe Formation. This is the third factor that may have kept the sandstones of Xujiahe Formation tight finally. The hydrocarbon was extensively generated from organic materials after the second quartz overgrowth, and selectively entered favorable reservoirs to form tight sandstone gas reservoirs.

关键词： diagenetic fluids tight reservoirs Xujiahe Formation Sichuan Basin inclusions

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New chronological evidence for Yanshanian diagenetic mineralization in China's Altay orogenic belt

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Chinese Science Bulletin 2000年第2期45卷 108-114页

作者： Fuwen Chen Huaqin Li Denghong Wang Hong Cai Wen Chen Department of Geology Peking University Beijing China Yichang Institute of Geology and Mineral Resources Ministry of Land and Mineral Resources Yichang China Institute of Mineral Deposits Ministry of Land and Mineral Resources Beijing China Institute of Geology Ministry of Land and Mineral Resources Beijing China

Granitoids and related pegmatitic rare-metal deposits are widespread in China’s Altay region,they used to be considered as Hercynian rocks and mineral *** here are the^40Ar^39Ar ages of potassium-rich minerals (muscovite and microcline)in the Koktokay pegmatitic rare-metal orefield and whole-rock as well as quartz fluid-inclusion Rb-Sr isochron ages of granite and ores in the Shangkelan pegmatite rare-metal orefield. The ages indicate that there are Yanshanian diagenetic Mineralization events happening in China’s Altay orogenic belt and that formation of the famous Koktokay No.3 pegmatitic rare-metal deposit endured about 30 Ma of magmatic crystallization differentiation.

关键词： Yanshanian diagenetic mineralization isochronological evidence Altay orogenic belt.

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Experiment of the ^(40)Ar/^(39)Ar dating of diagenetic illite in gas reservoirs

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Chinese Science Bulletin 2004年第S1期49卷 89-93页

作者： WANG Longzhang, DAI Tongmo & PENG Ping’an State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China Faculty of Resources, Chinese University of Geosciences, Wuhan 430074, China Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Peoples R China China Univ Geosci Fac Resources Wuhan 430074 Peoples R China

40Ar/39Ar dating of diagenetic illite has been performed to investigate gas reservoirs in the Sulige Gas Field of the northern Ordos Basin. A series of technical challenges were confronted, including illite purification, Ar recoil loss, and separation of diagenetic illite from detrital illite. Mineral growth ages for diagenetic illite were obtained by this experiment, from which the age of gas emplacement was deduced to be later than 169 Ma.

关键词： 40Ar/39Ar dating diagenetic illite purification of clay minerals Ar recoil loss time of gas emplacement.

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SEPARATION OF IRON AND MANGANESE IN THE EARLY diagenetic PROCESSES AND ITS MECHANISM OF BIOGEOCHEMISTRY

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Science China Chemistry 1989年第7期32卷 884-896页

作者：鲍根德 The Second Institute of Oceanography State Oceanic Administration Hanhzhou

Study shows that the reduction of iron (Fe^(3+)) and manganese (Mn^(4+)) in modern sedi-ments and the diffusive flux of the Mn^(2+) from the pore water into the overlying waterare mainly controlled by bacteria, and the distribution of the bacteria is believed to beaffected strongly by the sedimentary environment. It is the diffusive fluxes between Fe^(2+)and Mn^(2+) that lead to the separation of iron and manganese in the modern sediment at theChangjiang Mouth and near the shore. The level of the separation decreases with theincrease of the overlying water salinity and increases from the surface to the depth. Thismechanism has given a new explanation why manganese is concentrated in sediments onthe oceanic floor of ferromanganese-rich nodules.

关键词： iron manganese separation early diagenetic processes biogeochemistry Changjiang Mouth

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diagenetic Sequences Analysis of Fuyu Reservoir in Qijia-Gulong Depression,Northern Songliao Basin

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Global Geology 2002年第1期7卷 43-49页

作者： YAN Jianping, LIU Li, ZHANG Xinrong and MA Yanping(College of Earth Sciences, Jilin University, Changchun 130061, P. R. China) College of Earth Sciences Jilin University Changchun130061 P. R. China

Five paragenetic associations are recognized in Fuyu reservoir of Qijia - gulong depression of Daqing oil field: 1 )detrital illite permeation, glauconite and pyrite precipitation; 2 ) feldspar dissolution, kaolinite precipitation and the incipient quartz overgrowths; 3 ) early calcite cements; 4 ) postdate quartz overgrowths and pore - filling quartz, authigenetic illite and chlorite formation, feldspar overgrowths, petroleum injections, K - feldspar and calcite cement dissolution; 5) pore - filling calcite and calcite replacement.

关键词： diagenetic sequence, Fuyu reservoir, Diagenesis

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diagenetic Alteration Modes of the Deep Formation of Paleogene of Chezhen Depression,Bohai Bay Basin

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地学前缘 2009年第S1期16卷 132-132页

作者： Jing Yuan,Yuxin Guo,Xin Chen College of Geoscience and Information,China University of Petroleum,Qingdao 266555,China.

The deep buried clastic formation of Paleogene is an important hydrocarbon reservoir in the Chezhen *** are two types of diagenetic alteration modes in *** first mode is weak compaction, strong cementation,fracturing and weak dissolution in the sandstone and conglomerate on the steep slope of the *** reservoirs are cemented mainly by carbonate minerals strongly。

关键词： diagenesis diagenetic alteration mode porosity evolution deep formation Paleogene Chezhen depression Bohai Bay basin

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Hydrocarbon-water-rock interactions in the diagenetically altered system near major unconformities in Tarim Basin

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Chinese Science Bulletin 1996年第19期41卷 1631-1635页

作者：蔡春芳梅博文马亭陈传平柳常青 Jianghan Petroleum Institute Jingsha 434102 China

In the view of reservoir fluid geochemistry, we have proposed that there exist bacterially-mediated organic-inorganic diagenetic alterations, i.e. hydrocarbon-water-rock interactions in the North Tarim, and that organic acids were formed in situ by biodegradation of crude oils. The proposal is consistent with discussion from pyrolysis experiments. 1 Evidence from reservoir fluid geochemistry 1.1 Chromatographic characteristics of crude oils and extracts Normal crude oils produced from

关键词： organic acids hydrocarbon-water-rock interactions diagenetic mineral assemblage.

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Catalysis of aluminosilicate clay minerals to the formation of the transitional zone gas

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Science China Earth Sciences 1997年第2期40卷 130-136页

作者：雷怀彦师育新关平房玄 Lanzhou Institute of Geology Chinese Academy of Sciences Lanzhou 730000 China

It has been shown that the major clay minerals of the biothermocatalytic transitional zone source rock are montmorillonite, illite/montmorillonite (I/M) interlayer mineral, illite, kaolinite and chlorite. Within the depth of the transitional zone, montmorillonite could convert to the I/M ordered interlayer mineral via the I/M disordered one, i.e. in the intercrystalline layer of montmorillonite, Al3+ replaces Si4+ abundantly, resulting in a surface charge imbalance and the occurrence of a surface acidity. By means of the pyridine analytic method, the surface acidity of these aluminosilicate clay minerals is measured. The catalysis of aluminosilicate clay minerals, such as montmorillonite, illite and kaolinite to the thermo-degraded gas formation of the transitional zone is simulated in the differential thermal analysis-gas chromatography system and the alcohol dehydration catalyzed by clay minerals is employed to discuss this catalytic mechanism. Experiments have shown that montmorillonite is the major catalyst in the formation of the transitional zone gas and it lowers the thermo-degraded temperature of organic matter by 50℃.

关键词： aluminosilicate clay diagenetic evolution catalysis transitional zone gas

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Evolution of Authigenic Minerals and Porosity in the Deep Formation of Paleogene of Jiyang Sub-basin

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地学前缘 2009年第S1期16卷 142-143页

作者： Jing Yuan College of Geoscience and Information,China University of Petroleum,Qingdao 266555,China.

The clastic rocks in the depth of 2800-6000 m of the Paleogene in Jiyang sub-basin had undergone the middle diagenesis and late *** reservoirs in main areas of the sub-basin developed 2-6 secondary pores *** reservoirs in the stage A of middle diagenesis of Bonan fault zone in Zhanhua depression and of the gentle slope belt of Chezhen depression are controlled by the acidic diagenetic medium and developed one secondary pores zone in each diagenetic sub-stage *** contents ofautogenic quartz,pyrite and kaolinite are quite high in these *** reservoirs’

关键词： authigenic minerals secondary pores porosity evolution diagenetic medium deep formation Jiyang sub-basin

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Sedimentary diagenesis of rudist shoal and its control on reservoirs: A case study of Cretaceous Mishrif Formation, H Oilfield, Iraq

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Petroleum Exploration and Development 2018年第6期45卷 1075-1087页

作者： YU Yichang SUN Longde SONG Xinmin GUO Rui GAO Xingjun LIN Minjie YI Liping HAN Haiying LI Fengfeng LIU Hangyu Research Institute of Petroleum Exploration & Development PetroChina Daqing Oilfield Co.Ltd. PetroChina School of Earth and Space Sciences Peking University

Based on the core, cast thin section, whole rock analysis, conventional physical properties and high pressure mercury intrusion test, the sedimentary diagenesis characteristics of rudist shoal in Cretaceous Mishrif Formation of H Oilfield, Iraq and its control on the reservoir were studied. The rudist shoal of the Mishrif Formation develops in the high-stand systems tract and is distributed in the high places of paleogeomorphology on the edge of platform with strong hydrodynamic force. According to the relative sea level changes, lithologic evolution and sedimentary structure characteristics of the rudist shoal, the single rudist shoal is divided into four lithologic sections: A, B, C and D, that is, low-angle cross-bedding pelletoids-rudist packstone, low-angle cross-bedding and parallel bedding arene-rudist grainstone, parallel bedding rudist gravel limestone, and horizontal bedding carbonaceous mudstone. The complete sedimentary sequence of a single rudist shoal is often disrupted. Several rudist shoals superimpose to form thick rudist shoal sediment. The single rudist shoal thickness and lithologic sections assemblage change regularly in vertical direction. The rudist shoal has the characteristics of "strong dissolution, weak cementation and strong compaction", forming pore-type reservoir with intergranular pores, intergranular dissolved pores, mold pores, and dissolved pores. With mainly coarse pore throats larger than 5 μm, the reservoir is of medium-high porosity and high permeability. There is lithological reverse cycles inside single shoals and between single shoals, with content of mud crystals decreasing from the bottom to the top, dissolution increasing, cementation decreasing in strength, pore throats getting larger, and physical properties turning better. The rudist shoal of MB2-1 at the top of the high-stand systems tract has the largest thickness, moreover, subject to the strongest atmospheric freshwater leaching, this layer has the most significant

关键词： Iraq Cretaceous rudist shoal sedimentary process diagenetic evolution reservoir characteristics

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