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Connotation analysis, source-reservoir assemblage types and development potential of unconventional hydrocarbons in China

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Petroleum Research 2016年第2期1卷 135-148页

作者： Jianzhong Li Min Zhen Xiaoming Chen Denghua Li Shaoyong Wang Tao Song PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China

Through analysis of the connotation of unconventional hydrocarbons,the source-reservoir assemblages of unconventional hydrocarbons are divided into three types,i.e.,source-reservoir neighboring type,source-reservoir integration type,and source-reservoir separation type.The source-reservoir neighboring type resources mainly include tight oil and tight gas with the following formation conditions and characteristics:(1)efficient near-source accumulation close to high-quality source rocks with the pressure difference between source and reservoir as the dynamic force;(2)large-area tight reservoirs with certain porosity,dominated by micro-nanopores of inorganic origin;(3)distributed in depressions and slopes with large hydrocarbon-bearing area and great resource quantity,low abundance and local development of“sweet spots”;(4)weak tectonism.The source-reservoir integration type resources mainly include coalbed methane,shale gas,shale oil and oil shale.The formation conditions and characteristics are:(1)high abundance of organic matter,different types of organic matter and thermal evolution grades leading to formation of different resources types;(2)organic-rich sections are distributed continuously in the reservoiring space which is dominated by nanometer organic pores,interparticle pores and microfissures;(3)hydrocarbons mainly occur in free or adsorbed state,varying much with resource type;(4)the resources are self-conserved,and enriched in depressions and slopes,the conservation conditions are controlled by tectonics,temperature and pressure;(5)the production per well can be enhanced by volume fracturing,which increases the permeability of the reservoirs.The source-reservoir separation type resources are more special,mainly including(1)transformed conventional resources such as oil sand and heavy oil;(2)unsteady resources formed under special conditions of temperature and pressure,among which natural gas hydrate is a representative.These three types of resources in China are different in both development prospect and

关键词： Unconventional hydrocarbons connotation source-reservoir assemblage source-reservoir neighboring type source-reservoir integration type source-reservoir separation type development potential

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Tectonic-lithofacies paleogeography,large-scale source-reservoir distribution and exploration zones of Cambrian subsalt formation,Tarim Basin,NW China

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Petroleum Exploration and Development 2021年第6期48卷 1289-1303页

作者： WEI Guoqi ZHU Yongjin ZHENG Jianfeng YU Guang NI Xinfeng YAN Lei TIAN Lei HUANG Lili Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China PetroChina Hangzhou Research Institute of Geology(HIPG) Hangzhou 310023China Key Laboratory of Carbonate reservoirs CNPCHangzhou 310023China Research Institute of Petroleum Exploration&Development-Northwest(NWGI) PetroChinaLanzhou 730020China

To predict the large-scale source rock and reservoir distribution in Cambrian subsalt formations(Upper Sinian to Mid-Cambrian)in the Tarim Basin,more than 502D seismic lines and 3D data volume acquired latest,22 wells and some out-crops around this area were used to study the tectonic-lithofacies paleogeography,define the distribution of large scale source rocks and reservoirs,and sort out favorable zones.(1)The basin experienced evolution from ramp to deep-water mud-rich ramp,low-gradient slope,weak rimmed to strong rimmed platform,and the differentiation in the platform was controlled by pre-Cambrian palaeo-rifts.(2)The Luonan-Yubei ancient rift controlled the distribution of source rocks in the Lower Cambrian Yuertusi Formation,and this rift together with the northern depression are the main source rock area.(3)There are three sets of large-scale reservoirs,the Upper Sinian Qigebulake Formation,the Lower Cambrian Xiaorbulake Formation and the Wu-songger Formation,and shoal-mounds,early dolomitization and multi-levels of unconformities controlled reservoir develop-ment.(4)Four favorable zones,the north slope of Tazhong,upper slope of Maigaiti area,Keping-Wensu periphery,and south slope of Tabei,were evaluated.Of them,the north slope of Tazhong is most likely to have exploration breakthrough;the south slope of Tabei is the best area for exploring the Upper Sinian large scale weathering crust dolomite;Maigaiti slope and Kep-ing-Wensu periphery area improved in exploration potentials significantly,and are worth prospecting faster.

关键词： tectonic-lithofacies paleogeography source-reservoir assemblage favorable zone Late Sinian to Middle Cam-brian Tarim Basin

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