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Pore structure characterization based on NMR experiment: A case from the Shanxi Formation tight sandstones in the Daning-Jixian area, eastern Ordos Basin

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Energy Geoscience 2023年第3期4卷 266-275页

作者： Yunxi Teng chuang er Jingzhou Zhao Qiqi Guo Congmin Shen Shijin Tan School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’anShaanxi710065China Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi’anShaanxi710065China

The study of pore structure requires consideration of important factors including pore throat size,pore radius composition,and pore-throat *** the nuclear magnetic resonance(NMR)experimental results contain rich information about pore structures and fluid occurrence states,this study investigated the pore structures of the tight sandstone reservoirs of the Shanxi Formation in the Daning-Jixian area,eastern Ordos ***,by making the inverse cumulative curve of the NMR T2 spectrum coincide with the capillary pressure curves which were obtained by the mercury injection capillary pressure(MICP)technique,this study derived a conversion coefficient that can be used to convert the NMR T2 spectrum into the pore throat radius distribution curves based on the NMR experimental ***,we determined the pore radius intervals corresponding to irreducible water distribution using the NMR-derived pore radius distribution ***,the NMR T2 distribution curves based on the fractal theory were analyzed and the relationships between fractal dimensions and parameters,including permeability,porosity,reservoir quality index(RQI),flow zone indicator(FZI),irreducible water saturation,RT35,and RT50,were also *** NMR-derived pore throat radius distribution curves of the study area are mainly unimodal,with some curves showing slightly bimodal *** irreducible water mainly occurs in small pores with a pore radius less than 100 *** the permeability decreases,the contribution rate of small pores to the irreducible water gradually *** NMR-based fractal dimensions of pores show a two-segment *** pores have small fractal dimensions and are evenly distributed,while large pores have large fractal dimensions and complex pore *** fractal dimension of large pores(Dmax)is poorly correlated with porosity but strongly correlated with FZI,RQI,RT35,and *** results indicate that large pores are the ma

关键词： Pore structure Nudear magnetic resonance(NMR) Pore size distribution Fractal dirnension Irreducible water saturation

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The petroleum system:a new classification scheme based on reservoir qualities

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Petroleum Science 2019年第2期16卷 229-251页

作者： Jing-Zhou Zhao Jun Li Wei-Tao Wu Qing Cao Yu-Bin Bai chuang er School of Earth Sciences and Engineering Xi'an Shiyou University Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi'an Shiyou University

A new classification of petroleum systems(PSs) based on reservoir qualities is proposed. We classify PSs into the following three basic types:(1) source-rock petroleum system(SPS);(2) tight-reservoir or tight petroleum system(TPS);and(3) conventional-reservoir or conventional petroleum system(CPS). The CPS is a PS in which hydrocarbons accumulate in conventional reservoirs, and all the essential elements and processes are significant and indispensable. Oil and gas accumulations are geographically discrete and therefore exist as discontinuous accumulations. The TPS is a PS where hydrocarbons accumulate in tight reservoirs and the source rock, reservoir, seal, migration, and trap are also indispensable,but the traps are mostly non-anticlinal and the accumulations are primarily quasi-continuous and secondarily discontinuous. The SPS is a PS where both hydrocarbon generation and accumulation occurred in source rocks and traps and migration are unnecessary or inconsequential; the hydrocarbon distribution is extensive and continuous and has no distinct boundaries. The aforementioned three PSs can be derived from a common hydrocarbon source kitchen and are closely linked in terms of their formation and distribution. Therefore, to maximize the exploration efficiency, a comprehensive study and different strategies are needed by considering the SPS, TPS, and CPS as parts of a greater whole.

关键词： Petroleum system Classification Conventional petroleum system Unconventional petroleum system Source-rock petroleum system Tight petroleum system

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Petroleum accumulation:from the continuous to discontinuous

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Petroleum Research 2017年第2期2卷 131-145页

作者： Jingzhou Zhao Qing Cao Yubin Bai chuang er Jun Li Weitao Wu Wuxian Shen School of Earth Sciences and Engineering Shaanxi Key Laboratory of Petroleum Accumulation GeologyXi'an Shiyou UniversityShaanxi 710065China

Based on the extensive studies of conventional and unconventional hydrocarbon accumulations,the concept,classification and formation as well as distribution of petroleum reservoirs are *** revised concept defined the petroleum reservoir as a continuous hydrocarbon accumulation in a single or a set of reservoirs with an independent or uniform pressure *** terms of the pattern of hydrocarbon accumulation and distribution,the hydrocarbon accumulations are classified into three basic types,i.e.,the continuous accumulation,the quasi-continuous accumulation and the discontinuous *** hydrocarbon accumulation was demonstrated as a process from continuous accumulation to discontinuous accumulation,and therefore these three basic types of hydrocarbon accumulations were *** continuous hydrocarbon accumulation is principally formed in source rocks,and typical examples are shale hydrocarbon reservoirs and coal-bed methane reservoirs;it is mainly characterized by tight-ultra tight reservoirs with permeability of nanodarcy to millidarcy;the hydrocarbons occurred in free,adsorbed or dissolved state;a continuous accumulation comprises actually only a single reservoir,and hydrocarbons are extensively and continuously distributed within the scope of effective source rocks;the accumulation has neither defined boundaries nor bottom or edge water;oil and gas mainly accumulate in situ or near the generation of hydrocarbons with no prominent migration;this hydrocarbon accumulation process is basically not controlled by *** quasicontinuous hydrocarbon accumulation mostly occurs in the tight reservoirs adjacent to source rocks,and typical examples are most of tight hydrocarbon reservoirs;the hydrocarbons are distributed quasicontinuously in large areas,and each quasi-continuous hydrocarbon accumulation includes numerous adjacent small-to medium-size reservoirs;reservoirs of this kind of hydrocarbon accumulation have no defined boundaries,no or on

关键词： Petroleum reservoirs Continuous hydrocarbon accumulation Quasi-continuous accumulation Discontinuous accumulation

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Differences between Marine and Terrestrial Shale Gas Accumulation:Taking Longmaxi Shale Sichuan Basin and Yanchang Shale Ordos Basin as Examples

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 200-206页

作者： PU Boling DONG Dazhong ZHAO Jingzhou er chuang HUANG Jinliang School of Earth Sciences and Engineering Xi'an Shiyou University Xi'an Shaanxi 710065 China CNPC Research Institute of Petroleum Exploration & Development Beijing 100083 China

1 Introduction With the rapid development of theory and practice, shale gas has gradually become an important part in diversified energy structure. Though a lot of research have been done mainly for shale gas exploration prospects, geological conditions and shale gas accumulation have been analyzed and summarized, prospective resources have been preliminarily predicted, and favorable exploration and development zones have been proposed, shale gas exploration and development is still at the exploratory stage in China.

关键词： SHALE gas NATURAL gas -- Prospecting BASINS (Geology) GAS reservoirs PETROLEUM geology CHINA

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Features of Tight Sandstone Reservoir and Origin of Tightness:An Example from Chang-7 Member,Triassic Yanchang Formation in Chenghao Area,Ordos Basin

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 25-26页

作者： er chuang ZHAO Jingzhou BAI Yubin WU Weitao ZHANG Jie WEI Zhikun School of Earth Science and Engineering Xi'an Shiyou University Xi'an Shaanxi 710065 Shaanxi Key Lab of Petroleum Accumulation Geology Xi'an Shiyou University Xi'an Shaanxi 710065

1 Introduction Permeability of Member-6, Member-7, and Member-8, Triassic Yangchang Formation in Ordos Basin is lower than 1？0-3μm2, so sandstone in those formations are typical tight reservoir（ Zhao et al., 2012a,... 详细信息

关键词： SANDSTONE -- Research RESerVOIRS BASINS (Geology) CONFOCAL microscopy MICROPORES CHINA

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Petroleum Accumulation:from Continuous to Discontinuous

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 303-306页

作者： ZHAO Jingzhou CAO Qing BAI Yubin er chuang LI Jun WU Weitao SHEN Wuxian School of Earth Sciences andEngineering Xi'an Shiyou University Xi'an Shaanxi 710065 Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi'an Shiyou University Xi'an Shaanxi 710065

1 Introduction Petroleum accumulations from the Earth＇s crust can be grouped into conventional and unconventional ones. The history of the world＇s petroleum exploration is a history from the exploration of conventio... 详细信息

关键词： BIOACCUMULATION PETROLEUM HYDROCARBONS EARTH (Planet) PETROLEUM distribution CRUST

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鄂尔多斯盆地延长组长7段暗色泥页岩吸附特征及其影响因素

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地学前缘 2016年第1期23卷 146-153页

作者：赵靖舟王芮耳闯西安石油大学地球科学与工程学院陕西西安710065 西安石油大学陕西省油气成藏地质学重点实验室陕西西安710065 中国石油大港油田公司第二采油厂河北黄骅061100

鄂尔多斯盆地三叠系延长组长7段在研究区志丹-甘泉地区主要为一套深湖相暗色泥岩和页岩沉积,其TOC含量高、有机质类型主要为Ⅱ1型、Ro多在0.6%~1.2%,是该盆地已发现大量油藏的主要源岩。为了探讨长7段富有机质泥页岩的吸附特征,选取了... 详细信息

鄂尔多斯盆地三叠系延长组长7段在研究区志丹-甘泉地区主要为一套深湖相暗色泥岩和页岩沉积,其TOC含量高、有机质类型主要为Ⅱ1型、Ro多在0.6%~1.2%,是该盆地已发现大量油藏的主要源岩。为了探讨长7段富有机质泥页岩的吸附特征,选取了研究区长7段16块泥页岩样品进行了等温吸附、总有机碳含量、X-衍射、热成熟度及液氮吸附等配套分析测试,在此基础上探讨了长7段陆相富有机质泥页岩的吸附能力及其影响因素。结果表明：研究区长7段泥页岩的兰氏体积为0.56~4.43m3/t,随着压力的增大,吸附能力迅速增加,当增至一定程度,达到饱和后,将不再增加;泥页岩的吸附能力与有机碳含量、黏土矿物含量、比表面和孔体积具有正相关关系;与许多海相泥页岩相反,研究区陆相泥页岩的吸附能力与石英含量呈负相关关系,这可能与石英来源不同有关,陆相泥页岩的石英为陆源碎屑成因;泥页岩的吸附能力与热成熟度在Ro〈0.9%左右时呈负相关,而后当Ro〉0.9%时呈正相关关系。综合评价认为,TOC含量、黏土矿物含量是影响泥页岩吸附能力最重要的因素,而比表面是最直接的因素。

关键词：三叠系延长组陆相页岩等温吸附特征影响因素鄂尔多斯盆地

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环县-正宁地区延长组长9沉积体系及沉积演化特征研究

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西北地质 2021年第1期54卷 166-178页

作者：白卓立耳闯中国地震局第二监测中心陕西西安710065 西安石油大学地球科学与工程学院陕西西安710065 西安石油大学陕西省油气成藏地质学重点实验室陕西西安710065

以鄂尔多斯盆地环县—正宁地区三叠系延长组长9为研究对象,结合野外露头和岩心观察及测井资料分析,通过点、线、面研究步骤,精细刻画研究区延长组长91、长92沉积相特征及演化规律,为后期石油勘探开发做好指导工作。研究表明:环县—正宁... 详细信息

以鄂尔多斯盆地环县—正宁地区三叠系延长组长9为研究对象,结合野外露头和岩心观察及测井资料分析,通过点、线、面研究步骤,精细刻画研究区延长组长91、长92沉积相特征及演化规律,为后期石油勘探开发做好指导工作。研究表明:环县—正宁地区的沉积相类型为辫状河三角洲相和湖相沉积;其中辫状河三角洲平原亚相在露头区最为典型,辫状河三角洲前缘亚相是研究区的优势相带;长92比长91砂体更发育,西部比西南部和南部砂体更发育;长92沉积时期,辫状河三角洲平面展布趋势大致分为东西向和北东—南西向,按照区域可以分为4支三角洲;长91沉积时期辫状河三角洲沉积相比长92时期具有很好的继承性。

关键词：环县—正宁地区沉积特征沉积演化

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珠江口盆地白云凹陷深层储层特征与有效储层控制因素

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地球科学 2022年第7期47卷 2454-2467页

作者：廖计华吴克强耳闯中海油研究总院有限责任公司北京100028 西安石油大学地球科学与工程学院陕西西安710065

珠江口盆地白云凹陷珠海组和恩平组是该区深层油气勘探的主要层系,查明深层储层基本特征和有效储层控制因素对于白云凹陷深层油气勘探具有重要意义.基于岩石学和矿物学、成岩作用、孔隙特征及沉积相分析,明确了白云凹陷深层储层基本特征... 详细信息

珠江口盆地白云凹陷珠海组和恩平组是该区深层油气勘探的主要层系,查明深层储层基本特征和有效储层控制因素对于白云凹陷深层油气勘探具有重要意义.基于岩石学和矿物学、成岩作用、孔隙特征及沉积相分析,明确了白云凹陷深层储层基本特征.白云凹陷深层以低孔低渗和致密储层为主;压实作用是造成深层储层变差的主要原因,碳酸盐胶结和石英次生加大是主要的自生矿物;孔隙类型以粒间溶孔和粒内溶孔为主;有效储层以低孔低渗及以上储层为主,孔隙度总体保持在10%左右,渗透率变化范围大.中粗粒沉积相带、溶蚀作用和超压是深层有效储层的主要控制因素.中粗粒砂岩具有较好的原生孔和次生孔发育条件,渗透率较高,胶结减孔作用弱,溶蚀增孔作用强;溶蚀作用是深层关键的建设性成岩作用,溶蚀孔隙是深层主要的孔隙类型;超压传导作用有利于酸性流体活动和溶蚀物质的迁移,对形成溶蚀孔隙具有积极意义;分流河道和水下分流河道砂体是中粗粒砂岩的主要载体,应作为深层油气勘探的优选对象.

关键词：深层储层中粗粒相带溶蚀作用超压白云凹陷石油地质学

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沉积环境对富有机质页岩分布的控制作用——以鄂尔多斯盆地三叠系延长组长7油层组为例

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天然气地球科学 2015年第5期26卷 823-832,892页

作者：耳闯赵靖舟王芮魏之焜西安石油大学地球科学与工程学院陕西西安710065 陕西省油气成藏地质学重点实验室陕西西安710065

富有机质页岩厚度和分布范围是页岩油气形成条件评价的重要内容,而页岩的分布受沉积环境的控制。利用露头和岩心揭示了延长组长7油层组暗色页岩的沉积环境,通过露头和钻井资料确定了暗色页岩纵向结构特征,结合岩心和薄片资料阐述了暗色... 详细信息

富有机质页岩厚度和分布范围是页岩油气形成条件评价的重要内容,而页岩的分布受沉积环境的控制。利用露头和岩心揭示了延长组长7油层组暗色页岩的沉积环境,通过露头和钻井资料确定了暗色页岩纵向结构特征,结合岩心和薄片资料阐述了暗色页岩的沉积构造和显微层理特征;综合实测数据和测井解释资料分析了不同沉积环境下暗色页岩的有机碳含量和有机质类型差异。长7油层组暗色页岩主要发育在三角洲前缘水下分流间湾和半深湖—深湖环境下:三角洲前缘环境下的页岩连续厚度小,呈页岩、砂岩等厚互层或薄页岩和厚砂岩互层;半深湖—深湖环境下,页岩连续厚度大,砂岩厚度小,暗色页岩多发育页理、水平纹层或砂质纹层。三角洲前缘环境下,多以暗色泥岩、粉砂质泥岩为主,页理不发育,暗色页岩有机质类型以Ⅱ2型和Ⅲ型居多;半深湖—深湖环境下,有机碳含量明显高于三角洲前缘环境,有机质类型以Ⅰ型和Ⅱ1型居多。根据页岩纵向和平面分布、页岩沉积构造类型、有机质类型和有机碳含量综合评价认为,半深湖—深湖环境下形成的暗色页岩是延长组页岩油气最有利的勘探对象。

关键词：富有机质页岩页岩油气沉积环境页岩分布延长组

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