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Genetic types and distribution of shallow-buried natural gases

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Petroleum Science 2010年第3期7卷 347-354页

作者： Gao Yang Jin Qiang Zhu Guangyou College of Geo-resources and Information China University of Petroleum Dongying Shandong 257061 China Petroleum exploration and Development institute PetroChina Beijing 100083 China

Great volumes of shallow-buried （〈2.000 m） natural gases which are mainly composed of biogases and low-mature gases have been found in the Mesozoic-Cenozoic sedimentary basins in china. Many shallow gas reservoirs in china are characterized by coexistence of biogas and low-mature gas, so identifying the genetic types of shallow gases is important for {2. and development in sedimentary basins. In this paper, we study the gas geochemistry characteristics and distribution in different basins, and classify the shallow gas into two genetic types, biogas and low-mature gas. The biogases are subdivided further into two subtypes by their sources, the source rock-derived biogas and hydrocarbon-derived biogas. Based on the burial history of the source rocks, the source rock-derived biogases are divided into primary and secondary biogas. The former is generated from the source rocks in the primary burial stage, and the latter is from uplifted source rocks or those in a secondary burial stage. In addition, the identifying parameters of each type of shallow gas are given. Based on the analysis above, the distributions of each type of shallow gas are studied. The primary biogases generated from source rocks are mostly distributed in Quaternary basins or modem deltas. Most of them migrate in watersoluble or diffused mode, and their migration distance is short. Reservoir and caprock assemblages play an important role in primary biogas accumulation. The secondary biogases are distributed in a basin with secondary burial history. The oil-degraded biogases are distributed near heavy oil pools. The low-mature gases are widely distributed in shallow-buried reservoirs in the Meso-Cenozoic basins.

关键词： Primary biogas secondary biogas oil-degraded biogas low-mature gas genetic type gas identification gas accumulation distribution

Forming Mechanism of High Quality Reservoirs of Tertiary in the Southern Margin of Junggar Basin and Forecasting Before Drilling

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地学前缘 2009年第S1期16卷 139-140页

作者： Lihong Song,Shaoqiang Sui Sedimentary Reservoir Key Laboratories of Experimental Center,exploration and Development Research institute of {2. Petroleum,beijing 100083,{2..

Tertiary Junggar Basin has been subjected to a shrinking *** by the Yanshan orogeny, especially the Himalayan movement,the Tianshan Mountain continued to rise,leading the southern margin to the sedimentary environment with steep slope and speed *** major depositional facies in Ziniquanzi Formation is generally a set of delta under the setting of lake transgression,belonging to single deposi-

关键词： Junggar Basin Teritary reservoir heavy mineral diagenesis

PETROLIFEROUS　PROVINCE　AND　RESOURCE　POTENTIAL　OF　THE　NORTHEAST　ASIA　THE　MOST　PROSPECTIVE　NEW──THE　MOST　PROSPECTIVE　NEW　PROVINCE　IN　ASIA

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石油勘探与开发 1994年第2期 110-118页

作者： Hu Jian-yi Xu Shu-bao Don Li-rong(Research institute of Petroleum exploration and Development, CNPC.{2., china, 100083)

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ＰＥＴＲＯＬＩＦＥＲＯＵＳＰＲＯＶＩＮＣＥＡＮＤＲＥＳＯＵＲＣＥＰＯＴＥＮＴＩＡＬＯＦＴＨＥＮＯＲＴＨＥＡＳＴＡＳＩＡＴＨＥＭＯＳＴＰＲＯＳＰＥＣＴＩＶＥＮＥＷ──ＴＨＥＭＯＳＴＰＲＯＳＰＥＣＴＩＶＥＮＥＷＰＲＯＶＩＮＣＥＩＮＡＳＩＡＨｕＪｉａｎ－ｙ...

关键词： petroliferous basin folded belt (Northeast Asia) (Siberian Plate) (Sino-Korean Plate)

Hydrocarbon test in lower-layer atmosphere to predict deep-sea petroleum or hydrate in the Okinawa Trough: an example

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Acta Oceanologica Sinica 2003年第4期22卷 569-576页

作者： Gong Jianming1, Chen Jianwen 1, 2. Li Gang1, Zhang Xunhua1, Li Jipeng3, Huang Fulin1 1. Qingdao institute of Marine Geology, Qingdao 2.6071, china. 2. Ocean University of china, Qingdao 2.6003, china 3. Hefei institute of Petroleum Chemical exploration, china Petroleum exploration and Development Research institute, Hefei 2.002.,china Qingdao institute of Marine Geology Qingdao 266071 China Ocean University of china Qingdao 266003 China Hefei Inst. Petroleum Chem. Explor. China Petroleum Explor./Devmt. Res. Hefei 230022 China

Light hydrocarbon (methane, ethane, propane, butane and CO2. test and C isotopic analysis of CO are conducted for over 100 lower-layer atmospheric samples from the East china Sea slope and the Okinawa Trough. The results show that the lower-layer atmosphere mainly consists of CO2.and then of CH4, and the CO2.concentrations are calculated to have a high average value of 0.87 omega/10(-2. about three times that of the regional background (0-3 omega/10(-2.). The result also shows that the average value of C isotope - 2..8 x 10(-3) is given to the CO2. inferring that it is inorganic gas. Thus, for the future 's work in the Okinawa Trough, special attention should be paid to CO2.hydrate, which is very possibly an important hydrate type.

关键词： lower-layer atmosphere hydrocarbon test C isotopic analysis deep-sea petroleum gas hydrate

Mechanism of catalytic hydropyrolysis of sedimentary organic matter with MoS_2

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Petroleum Science 2011年第2期8卷 134-142页

作者： He Kun Zhang Shuichang Mi Jingkui Chen Jianping Cheng Lei Petroleum Geology Research and Central Laboratory Research Institute of Petroleum Exploration and Development （RIPED） PetroChina Beijing 100083 China CNPC Key Laboratories for Petroleum Geochemistry Beijing 100083 China

MoS2.was used as an efficient catalyst for hydropyrolysis （Hypy） of three samples of sedimentary organic matter with different maturities. Through comparison with Soxhlet extraction （SE）, it was found that MoS2.catalytic Hypy can remarkably promote the yields of total chloroform extracts, saturates, aromatics, hopanes and steranes. In addition, the difference of biomarker parameters indicated that isomerization of covalently-bound biomarkers is much more difficult than their free counterparts. Meanwhile, the high conversion of total organic carbon （TOC） in MoS2.catalytic Hypy of organic matter proved that the presence of dispersed molybdenum sulfide accelerated the breaking of C-C bonds and the release of hydrocarbons. To address the catalytic mechanism, a series of control experiments based on free Hypy and catalytic Hypy were conducted. The results showed that the calculated atomic ratio of carbon conversion/hydrogen conversion for catalytic Hypy was much larger than the presumed value of 1/2. indicating that intensive hydrogenation took place and significantly influenced the distribution of liquid products. Analysis of stable hydrogen isotope data, infrared spectra and m/z 83 ion chromatograph of the saturate fraction further confirmed this hypothesis. The difference of S content changing （AS） between catalyst-free Hypy and catalytic Hypy, and the thermal characteristics of the catalyst, indicated that active H2. was definitely generated and it probably initiated free radical reactions in the early stage of hydropyrolysis of organic matter.

关键词： Catalytic hydropyrolysis molybdenum disulfide kerogen coal Soxhlet extraction,biomarkers

Deep seismic reflection profiling revealing the complex crustal structure of the Tongling ore district

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Science china Earth Sciences 2004年第3期47卷 193-200页

作者： L5 Qingtian1, HOU Zengqian1, ZHAO Jinhua1, SHI Danian1, WU Xuanzhi1, CHANG Yinfo1, PEI Rongfu1,HUANG Dongding2.& KUANG Chaoyang2.1. institute of Mineral Resources, Chinese Academy of Geological Sciences, beijing 100037, {2. 2. The Sixth Geophysical exploration Brigade, Petroleum Bureau of East {2., Nanjing 2.0009, {2. institute of Mineral Resources Chinese Academy of Geological Sci. Beijing 100037 China The Sixth Geophys. Explor. Brigade Petroleum Bureau of East China Nanjing 210009 China

The deep seismic profiling across the Tongling ore district reveals a complex crustal structure. Strong contrasting dipping layered reflections (4—11 s, TWT),which dominate the lower crust of the northern part of the profile, are interpreted as the underplating of the basalt related to extensional tectonism. In the south of the profile, the Yangtze craton is characterized by strong reflections in the middle crust, showing a distinct two-layer crustal structure. Over the region of the Tongling uplift, there appear the complex arc shape reflections, suggesting folded, faulted and intruded structures, and the transparent zone below them reveals the existence of batholith. The south dipping strong reflections between the upper crust and lower crust (4—7 s, TWT) suggest a detachment between them. The detachment provided space for the magma intrusion, and caused the formation of the batholith. The Yangtze craton has a clear Moho re-flection, while the Tongling uplift has a weak Moho, whereas below the reflective lower crust in the northern part of the profile, there are sub-Moho reflections. The abrupt variation of the Moho characteristics within a short distance indicates the complexity of magmatic activity.

关键词： metallogenic belt, ore district, deep seismic profiling, crustal structure.

An initial discussion on major controlling factors on formation of coal-formed large-medium sas fields

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Chinese Science Bulletin 2000年第5期45卷 394-404页

作者： DAI Jinxing, XIA Xinyu, HONG Feng, ZHAO Lin, SUN Dongmin & SHI XinResearch institute of Petroleum exploration and Development, {2., china Correspondence should be addressed to Dai Jinxing Research institute of Petroleum exploration and Development Beijing China

The so-called "large-medium gas field" means a gas field with proven reserves equal to or larger than 100×108 m3. Up to 1997, 2. coal-formed great-medium fields are discovered in china, excluding two in Taiwan Province. Their proven reserves take 50.9% in total natural gas reserves. Therefore, the coal-formed great-medium gas field plays a decisive role in natural gas reserves and the study of their controlling factors is very important both in theory and in practice. There are six major controlling factors on the formation of coal-formed large-medium gas fields: ( Ⅰ) The generating center of coal-formed gas and its surrounding area; (Ⅱ) low potential area; (Ⅲ) late pool-forming period; (Ⅳ) traps related to the paleo-uplifits in coal-formed gas area; (Ⅴ) above or between abnormally pressured compartments; (Ⅵ) faulted traps related to coal-bed.

关键词： coal-formed gas large-medium gas field controlling factor.

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对油气圈闭勘探决策理论和方法的讨论

石油学报 2003年第2期24卷 50-53页

作者：王川彭苏萍中国石化石油勘探开发研究院北京100083 中国矿业大学北京100083

在运用目前流行的勘探决策方法 (如决策树方法等 )进行勘探决策时 ,无论勘探工作处于何阶段 ,总是要考虑勘探工作全过程的投入和产出。但油气勘探是分阶段的 ,若要在每个阶段的勘探决策工作中都考虑勘探开发全过程的投入和产出 ,一是会... 详细信息

在运用目前流行的勘探决策方法 (如决策树方法等 )进行勘探决策时 ,无论勘探工作处于何阶段 ,总是要考虑勘探工作全过程的投入和产出。但油气勘探是分阶段的 ,若要在每个阶段的勘探决策工作中都考虑勘探开发全过程的投入和产出 ,一是会给勘探决策工作带来实际的操作困难 ,二是造成错误的勘探决策结果。若油气勘探工作在每个阶段都能以最小的成本实现每个阶段的工作目标 ,那么 ,油气勘探工作的全过程也就能以最小的成本 ,获得最好的结果。为此 ,提出了油气勘探决策工作应该分阶段进行 ,并提出了一种在勘探阶段以落实储量为目标而优选圈闭的勘探决策方法。

关键词：勘探决策油气圈闭地质风险勘探成本预期储量

A hydrocarbon enrichment model and prediction of favorable accumulation areas in complicated superimposed basins in china

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Petroleum Science 2010年第1期7卷 10-19页

作者： Pang Xiongqi Meng Qingyang Jiang Zhenxue Liu Luofu Lu Xiuxiang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China Research institute of Petroleum exploration and Development PetroChina Beijing 100083 China

The geologic conditions of superimposed basins in china are very complicated. This is mainly shown by multi-phase structural evolution, multiple sets of source-reservoir-cap rock combinations, multiple stages of hydrocarbon generation and expulsion from source rocks, multi-cycle hydrocarbon enrichment and accumulation, and multi-phase reservoir adjustment and reconstruction. The enrichment, accumulation and distribution of hydrocarbon is mainly controlled by the source rock kitchen, paleo- anticline, regional cap rock and intensity of tectonic movement. In this paper, the T-BCMS model has been developed to predict favorable areas of hydrocarbon accumulation in complicated superimposed basins according to time and spatial relationships among five key factors. The five factors include unconformity surface representing tectonic balancing （B）, regional cap rock representing hydrocarbon protection （C）, paleo-anticline representing hydrocarbon migration and accumulation （M）, source rock kitchen representing hydrocarbon generation and expulsion （S） and geological time （T）. There are three necessary conditions to form favorable areas of hydrocarbon accumulation. First, four key factors BCMS should be strictly in the order of BCMS from top to bottom. Second, superimposition of four key factors BCMS in the same area is the most favorable for hydrocarbon accumulation. Third, vertically ordered combination and superimposition in the same area of BCMS should occur at the same geological time. The model has been used to predict the most favorable exploration areas in Ordovician in the Tarim Basin in the main hydrocarbon accumulation periods. The result shows that 95% of the discovered Ordovician hydrocarbon reservoirs are located in the predicted areas, which indicates the feasibility and reliability of the key factor matching T-BCMS model for hydrocarbon accumulation and enrichment.

关键词： Complicated superimposed basin key factor matching T-BCMS model favorable area for hydrocarbon accumulation hydrocarbon distribution prediction