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Geochemical characteristics of pyrolysis gas from epimetamorphic rocks in the northern basement of Songliao Basin,Northeast china

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Science china Earth Sciences 2008年第S1期51卷 140-147页

作者： YANG Chun 1 ,LUO Xia 2 ,LI Jian 2 ,LI ZhiSheng 2 ,LIU QuanYou 3 &Wang YuLin 4 1 Department of Earth Sciences,Zhejiang University,Hangzhou 310027,china 2 research institute of petroleum exploration and development(langfang Branch),langfang 065007,china 3 research institute of petroleum exploration and development,Beijing 100083,china 4 Department of Source and Environment,Liaoning Technical University,Fuxin 123000,china Department of Earth Sciences Zhejiang University Hangzhou China research institute of petroleum exploration and development (langfang Branch) Langfang China research institute of petroleum exploration and development Beijing China Department of Source and Environment Liaoning Technical University Fuxin China

The Xushen gas field,located in the north of Songliao Basin,is a potential giant gas area for china in the *** proved reserves have exceeded 1000×10 8 m 3 by the end of ***,the origin of natural gases from the deep strata is still in *** rocks as a potential gas source are widely spreading in the northern basement of Songliao *** to pyrolysis experiments for these rocks in the semi-confined system,gas production and geochemistry of alkane gases are discussed in this *** Carboniferous-Permian epimetamorphic rocks were heated from 300℃to 550℃,with temperature interval of 50℃.The gas production was quantified and measured for chemical and carbon isotopic *** show thatδ13C 1 is less than?20‰,carbon isotope trend of alkane gas isδ13C 1 2 2 >δ13C 3 ,these features suggest that the gas would be coal-type gas at high-over maturity,not be inorganic gas with reversal trend of gaseous alkanes (δ13C 1 >δ13C 2 >δ13C 3 ).These characteristics of carbon isotopes are similar with the natural gas from the basin basement,but disagree with gas from the Xingcheng ***,the mixing gases from the pyrolysis gas with coal-typed gases at high-over maturity or oil-typed gases do not cause the reversal trend of carbon *** gas generation intensity for epimetamorphic rocks is 3.0×10 8 ―23.8×10 8 m 3 /km 2 ,corresponding to Ro from 2.0%to 3.5%for organic matter.

关键词： Northern Songliao Basin epimetamorphic rock pyrolysis experiment gas generation potential carbon isotope

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Sequence stratigraphic framework and distribution of depositional systems for the Paleogene in Liaodong Bay area

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Science china Earth Sciences 2008年第S2期51卷 1-10页

作者： ZHU XiaoMin1,DONG YanLei1,YANG JunSheng1,ZHANG Qin1,LI DeJiang2,XU ChangGui3 & YU Shui3 1 National Key Laboratory of petroleum Resources and Prospecting,china University of petroleum,Beijing 102249,china 2 research institute of petroleum exploration and development——langfang,Petrochina,langfang 065007,china 3 Technology Department of CNOOC Tianjin Company,Tianjin 300452,china National Key Laboratory of petroleum Resources and Prospecting China University of Petroleum Beijing China research institute of petroleum exploration and development—langfang PetroChina Langfang China Technology Department of CNOOC Tianjin Company Tianjin China

With a comprehensive geological and geophysical data base,the Paleogene in the Liaodong Bay area,which consists of the Kongdian,Shahejie and Donghying Formations from the base to top,was divided into 4 second-order sequences and 8 third-order sequences based on the characteristics of the se-quence boundaries. Each third-order sequence is subdivided into the lowstand,lake transgressive and highstand systems tracts. The Lowstand systems tract (LST) is mainly composed of progradational parasequence sets,while the lake transgressive systems tract (TST) largely consists of the retrograda-tional parasequence sets and the highstand systems tract (HST) is dominated by the progradational parasequence sets. The main types of depositional systems include the shallow lake,semi-deep lake,deep lake,delta,fan delta,braided fluvial delta and nearshore subaqueous fan. The braided fluvial delta and fan delta depositional systems are mainly confined to the sequences of the lower SEs4-Ek,SEs3 and SEs1+2,while the sequences of SEd3,SEd2 and SEd1 are dominated by the delta and nearshore subaqueous fan depositional systems with the latter being developed at the downthrown side of the basin-bounding fault in each sequence. The evolution of the depositional systems is always con-trolled by the paleo-tectonic setting and the ancient landform in the space and geological time. It is concluded that the most favorable reservoirs are distributed in the Liaoxi low uplift and the central Liaozhong sag.

关键词： Liaodong Bay area Paleogene sequence stratigraphy sequence boundary depositional system

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气井压裂后稳态产能的计算

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石油学报 2003年第4期24卷 65-68页

作者：汪永利蒋廷学曾斌中国地质大学北京100083 中国石油勘探开发研究院廊坊分院河北廊坊065007

应用保角变换原理 ,将求解带垂直裂缝的气井产量问题转化为简单的单向渗流问题。保角变换方法能将Z平面上特别复杂的渗流问题转化为W平面上相对简单和易于求解的渗流问题。变换后 ,可用于描述井筒附近较为复杂的流动型态 (裂缝内流动和... 详细信息

应用保角变换原理 ,将求解带垂直裂缝的气井产量问题转化为简单的单向渗流问题。保角变换方法能将Z平面上特别复杂的渗流问题转化为W平面上相对简单和易于求解的渗流问题。变换后 ,可用于描述井筒附近较为复杂的流动型态 (裂缝内流动和非裂缝区域拟径向流动 )对压裂后产能的贡献。变换后假设的缝端封闭边界条件更符合实际。然后再根据微元体流动分析 ,综合应用物质守衡原理、非达西运动方程和压力耦合原理 ,导出了裂缝内变质量流动时压力满足的二阶微分方程 ,进而推导出不同缝长和导流能力 (包括无限导流能力和有限导流能力 )裂缝井的产能公式。将计算结果与现场某气井压裂后产量相比 ,两者吻合程度较好。该计算方法简单易行 ,便于现场应用。

关键词：气井压裂保角变换原理垂直裂缝单向渗流稳态产能计算方法

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Study on estimate method of wave velocity and quality fac-tor to fault seals

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Science Bulletin 2005年第19期 125-130页

作者： LI Zhensheng1, LIU Deliang1, LIU Bo1, YANG Qiang1 & LI Jingming2 1. The School of Earth and Space Sciences, University of Science and Technology of china, Hefei 230026, china 2. research institute of petroleum exploration and development, Petro-china, langfang 065007, china

Based on ultrasonic test of fault rocks, the re-sponses for wave velocity and quality factor (Q value) to lithology, porosity and permeability of fault rocks and me-chanical property of faults are studied. In this paper, a new quantitative estimate method of fault seals is originally of-fered. The conclusions are as follows: (1) Wave velocity and Q value increase and porosity decreases with the increase in stress perpendicular to joint; (2) In compressive and com-presso-shear fault rocks that are obviously anisotropic com-pared with their original rocks, the wave velocity and Q value are greater in the direction parallel with foliation, and usually less perpendicular to it. In tensile and tenso-shear fault rocks that are not obviously anisotropic, the wave ve-locity and Q value are under that of original rocks; (3) In foliated fault rocks, the direction with minimal wave velocity and Q value is the best direction for sealing; on the contrary it is the best for flowing; (4) Structural factures develop mainly along foliation, the minimal wave velocity and Q value reflect the flowing capacity in parallel direction to fo-liation, and the maximal wave velocity as well as Q value reflect the sealing capacity in normal direction to foliation. The new estimate method is based upon contrast of wave velocity and Q value between fault rocks and their original rocks, and is divided into three parts that are respectively to identify rock’s lithology, to judge mechanic property of faults and to Judge sealing capacity of faults. Although there is vast scale effect between ultrasonic wave and seismic wave, they have similar regularity of response to fabric and porosity of faults. This research offers new application for seismic data and petrophysical basis for seismological estimation of fault seals. The estimate precision will be improved with the en-hancement of three-dimensional seismic prospecting work.

关键词： wave velocity quality factor fault seals anisotropy folia-tion.

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四川盆地高石梯—磨溪构造带震旦系灯影组的成藏模式

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天然气地球科学 2004年第6期15卷 584-589页

作者：张林魏国齐汪泽成吴世祥沈珏红中国矿业大学江苏徐州221008 中国石油勘探开发研究院廊坊分院河北廊坊100083 中国石油勘探开发研究院北京100083

高石梯—磨溪构造带是四川盆地震旦系灯影组重要的勘探前景区。应用激光荧光、包裹体和同位素等技术判识了油气运聚信息,分析了灯影组圈闭演化及储层特征,建立了成藏模式。高石梯-磨溪构造带在加里东运动后形成了相对古隆起区,在印支、... 详细信息

高石梯—磨溪构造带是四川盆地震旦系灯影组重要的勘探前景区。应用激光荧光、包裹体和同位素等技术判识了油气运聚信息,分析了灯影组圈闭演化及储层特征,建立了成藏模式。高石梯-磨溪构造带在加里东运动后形成了相对古隆起区,在印支、燕山和喜山早期仍为古隆起区,喜山晚期运动形成了大型圈闭。该区有溶洞型、孔洞型和裂缝型3类含气层,分为震旦系顶部和灯二段两套含气组合。该区烃源岩主生油气期为早中侏罗世,主生气期为早白垩世,是一个持续演化的背斜型气藏。因此,该区是油气运移指向区,是有利勘探区带。

关键词：油气运聚灯影组含气组合气藏特征

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过渡金属对有机质热解生烃过程的影响

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天然气地球科学 2004年第3期15卷 317-319页

作者：宁占武王卫华温美娟李剑北京科技大学北京100083 石油勘探研究院廊坊分院河北廊坊065007

利用热模拟实验,探讨了过渡金属对有机质(胆甾醇和正十六烷)热解生烃过程的影响。实验结果表明:过渡金属的存在降低了有机质热解成烃的表观活化能,使得生烃温度提前;过渡金属的存在改变了热解产物的组成,使饱和烃含量相对增加。认为过... 详细信息

利用热模拟实验,探讨了过渡金属对有机质(胆甾醇和正十六烷)热解生烃过程的影响。实验结果表明:过渡金属的存在降低了有机质热解成烃的表观活化能,使得生烃温度提前;过渡金属的存在改变了热解产物的组成,使饱和烃含量相对增加。认为过渡金属对低温下有机质成烃起着至关重要的作用。

关键词：过渡金属胆甾醇正十六烷热解催化

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The special sealing mechanism of caprock for Quaternary biogenetic gas in Sanhu area,Qaidam Basin,china

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Science china Earth Sciences 2008年第S1期51卷 45-52页

作者： LI Jian 1 ,YAN QiTuan 1 ,ZHANG Ying 1 ,LIU GuangDi 2 &WANG XiaoBo 1 1 research institute of petroleum exploration and development-langfang,langfang 065007,china 2 University of petroleum,Beijing 102249,china research institute of petroleum exploration and development-langfang Langfang China University of petroleum Beijing China

The Quaternary biogenetic gas reservoirs in the east of Qaidam Basin have many characteristics such as late forming time,shallow burial depth,low diagenetic grade,high porosity and high permeability and so *** cannot be considered as caprock according to the traditional evaluation ***, the large scale and high efficient biogenetic gas reservoirs of the Qaidam Basin are really formed under these kinds of caprocks,so it does have some specialty in its sealing *** at the special sealing mechanism,some simulating experiments have been *** research results show that the sealing ability of biogenetic gas caprock is related with water saturation,the caprock that is saturated with salt water can effectively block seepage and ***,the multiple reservoir-caprock groups have accumulated sealing effect,causing the formation of big gas *** evaluation method with traditional caprock parameters cannot be adopted in evaluating the study area.

关键词： Qaidam Basin biogenetic gas caprock sealing mechanism diffusion water saturation accumulated sealing

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Natural gas geochemistry and its origins in Kuqa depression

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Science china Earth Sciences 2008年第S1期51卷 174-182页

作者： LIU QuanYou 1 ,QIN ShengFei 1 ,LI Jian 2 ,LIU WenHui 3 ,ZHANG DianWei 3 ,ZHOU QingHua 1 &HU AnPing 1 1 research institute of petroleum exploration and development,Petrochina,Beijing 100083,china 2 langfang Branch of research institute of petroleum exploration and development,Petrochina,langfang 065007,china 3 exploration and Production research institute,SINOPEC,Beijing 100083,china research institute of petroleum exploration and development PetroChina Beijing China langfang Branch of research institute of petroleum exploration and development PetroChina Langfang China exploration and Production research institute SINOPEC Beijing China

According to gas compositional and carbon isotopic measurement of 114 gas samples from the Kuqa depression,accumulation of the natural gases in the depression is dominated by hydrocarbon gases, with high gas dryness(C1/C1-4)at the middle and northern parts of the depression and low one towards east and west sides and southern *** carbon isotopes of methane and its homologues are relatively enriched in 13 C,and the distributive range ofδ13C 1 ,δ13C 2 andδ13C 3 is-32‰―-36‰,-22‰―-24‰and-20‰―-22‰,*** general,the carbon isotopes of gaseous alkanes become less negative with the increase of carbon ***δ13C CO2 value is less than-10‰in the Kuqa depression,indicating its organogenic *** distributive range of 3 He/ 4 He ratio is within n×10-8 and a decrease in 3 He/ 4 He ratio from north to south in the depression is *** on the geochemical parameters of natural gas above,natural gas in the Kuqa depression is of characteristics of coal-type gas *** possible reasons for the partial reversal of stable carbon isotopes of gaseous alkanes involve the mixing of gases from one common source rock with different thermal maturity or from two separated source rock intervals of similar kerogen type,multistages accumulation of natural gas under high-temperature and over-pressure conditions,and sufficiency and diffusion of natural gas.

关键词： Kuqa depression natural gas stable carbon isotope gas origin

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Structural characteristics and petroliferous features of Tarim Basin

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Chinese Science Bulletin 2002年第S1期47卷 1-11页

作者： JIA Chengzao~1 & WEI Guoqi~2 1. Petrochina Company Limited, Beijing 100011, china 2. langfang Branch of research institute of petroleum exploration & development, Petrochina, langfang 065007, china Petrochina Company Limited Beijing China langfang Branch of research institute of petroleum exploration & development PetroChina Langfang China

Using the modern tectonic geology theories andmethods such as the plate tectonic analysis, the paleo-struc-ture analysis, the structural-Iithofacies analysis, and the faultrelated fold and petroleum system, and combining with theseismic data, well drilling data and the circumferential fieldgeology, study on the structural characteristics and petro-leum prospect in the Tarim Basin has been carried out. Re-sults show that the Tarim Basin is a large superimpositionand combination basin with continental crustal basement,composed of a Paleozoic craton and Meso-Cenozoic forelandbasins. The characteristics of the basin are: the kernel partof the basin is the marine facies Paleozoic craton, superim-posed 4 continental facies foreland basins. Though the scaleof the paleozoic craton of the Tarim Basin is relatively small,the structure is steady. The petroleum prospect of the Paleo-zoic craton is: multiphase pool-generation and accumulationcontrolled by ancient uplift. The Meso-Cenozoic forelandbasins in the Tarim Basin, which are distributed on the era-tonic circumference and are a long-term subsidence, turnedinto rejuvenated foreland basins after the Meso-Cenozoicperiod. The petroleum prospects are: coal-bed generatinghydrocarbon, abundant natural gas, pool-generation in laterand recent periods, the oil and gas distribution controlled bythe foreland thrust belt. The structural characteristics ofTarim provide it with a superimposition and combinationpetroleum system of multiple resources, multiple reservoirsand multiphase pool-generation. The oil and gas explorationprospect covers two large fields: the Paleozoic craton and theMeso-Cenozoic foreland thrust belt.

关键词： Tarim superimposition and combination basin craton foreland basin superimposition and combination petroleum system.

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Distribution and fractionation mechanism of stable carbon isotope of coalbed methane

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Science china Earth Sciences 2006年第12期49卷 1252-1258页

作者： QIN Shengfei1, TANG Xiuyi2, SONG Yan1 & WANG Hongyan3 1. research institute of petroleum exploration and development, Petrochina, Beijing 100083, china 2. Anhui Science and Technology College, Huainan 232000, china 3. langfang Branch, research institute of petroleum exploration and development, Petrochina, langfang 065007, china research institute of petroleum exploration and development PetroChina Beijing China Anhui Science and Technology College Huainan China langfang Branch Research Institute of Petroleum Exploration and Development PetroChina Langfang China

The stable carbon isotope values of coalbed methane range widely, and also are gener- ally lighter than that of gases in normal coal-formed gas fields with similar coal rank. There exists strong carbon isotope fractionation in coalbed methane and it makes the carbon isotope value lighter. The correlation between the carbon isotope value and Ro in coalbed methane is less obvious. The coaly source rock maturity cannot be judged by coalbed methane carbon isotope value. The carbon isotopes of coalbed methane become lighter in much different degree due to the hydrodynamics. The stronger the hydrodynamics is, the lighter the CBM carbon isotopic value becomes. Many previous investigations indicated that the desorption-diffusion effects make the carbon isotope value of coalbed methane lighter. However, the explanation has encountered many problems. The authors of this arti- cle suggest that the flowing groundwater dissolution to free methane in coal seams and the free methane exchange with absorbed one is the carbon isotope fractionation mechanism in coalbed methane. The flowing groundwater in coal can easily take more 13CH4 away from free gas and com- paratively leave more 12CH4. This will make 12CH4 density in free gas comparatively higher than that in absorbed gas. The remaining 12CH4 in free gas then exchanges with the adsorbed methane in coal matrix. Some absorbed 13CH4 can be replaced and become free gas. Some free 12CH4 can be ab- sorbed again into coal matrix and become absorbed gas. Part of the newly replaced 13CH4 in free gas will also be taken away by water, leaving preferentially more 12CH4. The remaining 12CH4 in free gas will exchange again with adsorbed methane in the coal matrix. These processes occur all the time. Through accumulative effect, the 12CH4 will be greatly concentrated in coal. Thus, the stable carbon isotope of coalbed methane becomes dramatically lighter. Through simulation experiment on wa- ter-dissolved methane, it had been proved that the f

关键词： coalbed methane,methane stable carbon isotope,fractionation mechanism,accumulative effect.

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