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Genetic mechanism and development of the unsteady Sarvak play of the Azadegan oil field,southwest of Iran

Petroleum Science 2016年第1期13卷 34-51页

作者： Yang Du Jie Chen Yi Cui Jun Xin Juan Wang Yi-Zhen Li Xiao Fu School of Geoscience and Technology Southwest Petroleum University Geology and Exploration Research Institute CNPC Chuanqing Drilling Engineering Company Limited Iraq Branch company of CNODC CNPC

The upper Cretaceous Sarvak reservoir in the Azadegan oil field of southwest Iran has its oil–water contact nearly horizontal from the north to the center and dips steeply from the center to the *** purpose of this paper is to interpret this abnormal reservoir feature by examining the accumulation elements,characteristics,and evolution based on the 3D seismic,coring,and well logging ***,in the field,the Sarvak reservoir is massive and vertically heterogeneous,and impermeable interlayers are *** distribution of petrophysical properties is mainly dominated by the depositional paleogeomorphology and degrades from north to south *** source is the lower Cretaceous Kazhdumi Formation of the eastern Dezful sag,and the seal is the muddy dense limestone of the Cenozoic Gurpi and Pebdeh *** with the trap evolution,the accumulation evolution can be summarized as follows： the Sarvak play became a paleo-anticlinal trap in the Alpine tectonic activity after the late Cretaceous（96 Ma） and then was relatively peaceful in the later long geologic *** Kazhdumi Formation entered in the oil window at the early Miocene（12–10 Ma） and charged the Sarvak bed,thus forming the *** by the ZagrosOrogeny,the paleo-reservoir trap experienced a strong secondary deformation in the late Pliocene（4.Ma）,which shows as the paleo-trap shrank dramatically and the prelow southern area uplifted and formed a new secondary anticline trap,hence evolving to the current two structural highs with the south point（secondary trap） higher than the north（paleo-trap）.The trap deformation broke the paleoreservoir kinetic equilibrium and caused the secondary reservoir *** upper seal prevented vertical oil dissipation,and thus,the migration is mainly in interior Sarvak bed from northern paleo-reservoir to the southern secondary *** strong reservoir heterogeneity and the degradation trend of reservoir properties along migration pat

关键词： reservoir southwest Cretaceous migration geologic tectonic unsteady limestone depositional sandstone

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Lower limits of evaluation parameters for the lower Paleozoic Longmaxi shale gas in southern Sichuan Province

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Science China Earth Sciences 2013年第5期56卷 710-717页

作者： LI YanJun LIU Huan ZHANG LieHui LU ZongGang LI QiRong HUANG YongBin State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Department of Resources and Environment Southwest Petroleum University South Sichuan Gas Field of southwest Oil and Gas company PetroChina

Here we present six key parameters that have been applied to evaluate the Silurian Longmaxi shale gas accumulations of southern Sichuan *** parameters include richness of organic matter,single layer shale thickness,burial depth of the shale,maturity,shale properties,and brittle mineral *** combination with drilling data,the lower limits of these six parameters for marine shale gas have been evaluated and the following conclusions are drawn:(1)Organic carbon recovery, gas content inversion,and production tests have been applied for the first time to measure the lower limit of TOC,which is determined to be 1.0%.(2)Based on the hydrocarbon generation and expulsion theory for source rocks and the characteristics of Longmaxi shale,the lower limit of the single-layer thickness is estimated to be 30 m,of which a thickness of at least 15 m should contain high-quality shale.(3)Based on the correlation of TOC and porosity,the lower limit of gas-filled porosity is 1.2%.(4.Other parameters,such as maturity,burial depth,and brittle mineral content have also been studied with regard to the geologic conditions of southern *** on the study results,an evaluation index system has been established for highly evolved marine shale gas,and the system has been applied successfully to geologically screened shale gas occurrences in southern Sichuan Province.

关键词： shale gas lower limit evaluation system Longmaxi Formation southern Sichuan Province

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Comprehensive evaluation of chemical breakers for multistage network ultra-high strength gel

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Petroleum Science 2023年第5期20卷 2864-2878页

作者： Zheng Kang Hu Jia Zhong-Guo Li Biao Xia Yi Wang Yong Jiang Han-Lin Peng Petroleum Engineering Technology Institute of southwest Petroleum Branch SINOPECDeyang618000SichuanChina National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation of southwest Petroleum University Chengdu610500SichuanChina SINOPEC southwest Petroleum Engineering company Deyang618000SichuanChina

Polymer gels have been accepted as a useful tool to address many sealing operations such as drilling and completion,well stimulation,wellbore integrity,water and gas shutoff,***,we developed an ultra-high strength gel(USGel)for medium to ultra-low temperature ***,the removal of USGel is a difficult problem for most temporary plugging *** paper first provides new insights into the mechanism of USGel,where multistage network structure and physical entanglement are the main reasons for USGel possessing ultra-high *** the effects of acid breakers,encapsulated breakers,and oxidation breakers(including H_(2)O_(2),Na_(2)S_(2)O_(8),Ca(ClO)_(2),H_(2)O_(2)+NaOH,Na_(2)S_(2)O_(8)+NaOH,and Ca(ClO)_(2)+NaOH)were *** effects of component concentration and temperature on the breaking solution were studied,and the corrosion performance,physical simulation and formation damage tests of the breaking solution were carried *** final formulation of 2%-4.NaOH+4.5%-6%H_(2)O_(2) breaking solution was determined,which can make USGel completely turn into water at 35e105*** combinations of“acid t breaking solution”,“acid+encapsulated breaker”and“encapsulated breaker+breaking solution”were evaluated for breaking *** acid gradually reduced the volume of USGel,which increased the contact area between breaking solution and USGel,and the effect of“4.acid+breaking solution”was 23 times higher than that of breaking solution alone at 35***,the acid significantly reduced the strength of *** paper provides new insights into the breaking of high-strength gels with complex network structures.

关键词： Gel breaking Polymer gel Ultra-high strength Chemical breakers Multistage network

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The Major Controlling Factors and Different Oolitic Shoal Reservoir Characteristics of the Triassic Feixianguan Formation,Eastern Longgang Area,NE Sichuan Basin,SW China

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 895-908页

作者： GU Yifan JIANG Yuqiang LEI Xiaohua CHEN Zhiyong ZHOU Lu FU Yonghong JIANG Zengzheng School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Department of Geology University of ReginaReginaSaskatchewanSK S4S 0A2Canada Northeastern Sichuan Oil and Gas District PetroChina Southwest Oil and Gas Field CompanyDazhouSichuan 635000China Chongqing Gas Field PetroChina Southwest Oil and Gas Field CompanyChongqing 400021China Sichuan Geotech Science and Technology Ltd. Chengdu 610041China

Based on comprehensive analyses of occurrence,petrological observation,pore structure and geochemistry,the different reservoir characteristics and reservoir evolutionary pathways between different oolitic shoal reservoir types of the Feixianguan Formation on the west side of the Kaijiang-Liangping Trough have been *** exist three stages of high-energy slope break belts in the Feixianguan period,the corresponding three stages of oolitic shoals gradually migrating in the direction of the *** types of oolitic shoal reservoirs,namely,residual-oolitic dolomite,mold-oolitic dolomite and sparry oolitic limestone,were formed during sedimentary-diagenetic evolution,the pore types being intergranular dissolved pore,mold pore(or intragranular dissolved pore)and residual intergranular pore,*** petrology,physical properties and pore structure of the different types of oolitic shoal reservoirs are quite ***-oolitic dolomite reservoirs have the best quality,while sparry oolitic limestone reservoirs have the *** with analyses of trace elements,rare earth elements and carbon-oxygen isotopes,it is suggested that the formation of residual-oolitic dolomite reservoirs is jointly controlled by penesaline seawater seepage-reflux dolomitization and hydrothermal ***-pore oolitic dolomite reservoirs are controlled by penesaline seawater seepage-reflux dolomitization and meteoric water *** burial dissolution of organic acid not only further improves the reservoir qualities of previously formed oolitic dolomite reservoirs,but also preserves residual intergranular pores in the sparry oolitic limestone reservoirs.

关键词： oolitic shoal reservoir evolution geochemical characteristics Triassic System Feixianguan Formation Sichuan Basin

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Multi-Stage Hydrocarbon Accumulation and Formation Pressure Evolution in Sinian Dengying FormationCambrian Longwangmiao Formation, Gaoshiti-Moxi Structure, Sichuan Basin

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Journal of Earth Science 2016年第5期27卷 835-845页

作者： Juan Wu Shugen Liu Guozhi Wang Yihua Zhao Wei Sun Jinming Song Yanhong Tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Chuanzhong division of southwest Oil & Gasfield company Petro China

Sichuan Basin is a typical superimposed basin, which experienced multi-phase tectonic movements, meanwhile Sinian–Cambrian underwent complex hydrocarbon accumulation processes, causing exploration difficulties in the past 60 years. Based on the microscopic evidence of fluid inclusions, combined with basin-modelling, this paper determines stages and time of hydrocarbon accumulation, reconstructs evolution of formation pressure and dynamic processes of hydrocarbon accumulation in Sinian Dengying Formation-Cambrian Longwangmiao Formation of Gaoshiti-Moxi structure. Three stages of inclusions are detected, including a stage of yellow-yellowgreen fluorescent oil inclusions, a stage of blue fluorescent oil-gas inclusions and a stage of non-fluorescent gas inclusions, reflecting the study area has experienced a series of complex hydrocarbon accumulation processes, such as formation of paleo-oil reservoirs, cracking of crude oil, formation of paleo-gas reservoirs and adjustment to present gas reservoirs, which occurred during 219–188, 192–14. and 168–0 Ma respectively. During the period of crude oil cracking, Dengying Formation-Longwangmiao Formation showed weak overpressure to overpressure characteristics, then after adjustment of paleo-gas reservoirs to present gas reservoirs, the pressure in Dengying Formation changed into overpressure but finally reduced to normal pressure system. However, due to excellent preservation conditions, the overpressure strength in Longwangmiao Formation only slightly decreased and was still kept to this day.

关键词： Sichuan Basin Gaoshiti-Moxi structure Sinian-Cambrian hydrocarbon accumulation,formation pressure fluid inclusion.

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Experimental study on gas slippage of Marine Shale in Southern China

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Petroleum 2016年第2期2卷 171-176页

作者： Ying Ren Xiao Guo Chuan Xie Hongqin Wu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityNo.8Xindu AvenueXindu DistrictChengdu 610500China Shunan division of southwest Oil and Gasfield company PetroChinaSichuanLuzhou 646000China Research Institute of Drilling Engineering Sinopec Southwest Petroleum Engineering CompanySichuanDeyang 618000China

The shale gas reservoirs are composed of porous media of different length scales such as nanopores,micropores,natural fractures and hydraulic fractures,which lead to high *** flow from pores to fractures is under different flow regimes and in the control of various flow *** gas slippage would have significant effects on gas flow in *** obtain the effect of slippage on gas flow in matrix and fractures,contrast experiments were run by using cores with penetration fractures and no fractures from Marine Shale in Southern China under constant confining *** results showed that slippage effect dominates and increases the gas permeability of cores without *** cores with penetration fractures,slippage effect is associated with the closure degree of *** dominates when fractures close under low pore *** weakens due to the fractures opening under high pore *** opening reduces the seepage resistance and slippage *** Forchheimer effect occurs and leads to a permeability reduction.

关键词： Shale gas Permeability Fracture Slippage Effective stress

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Fault Characteristics in Longmen Mountain Thrust Belt, Western Sichuan Foreland Basin, China

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Journal of China University of Geosciences 2008年第6期19卷 611-624页

作者：万桂梅汤良杰杨克明金文正吕志洲余一欣 Basin and Reservoir Research Center China University of Petroleum State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Key Laboratory for Hydrocarbon Accumulation Mechanism Ministry of Education southwest division company SINOPEC

Through field geological survey, the authors found that abundant thrust faults developed in the Longmen （龙门） Mountain thrust belt. These faults can be divided into thrust faults and strike-slip faults according to their formation mechanisms and characteristics. Furthermore, these faults can be graded into primary fault, secondary fault, third-level fault, and fourth-level fault according to their scale and role in the tectonic evolution of Longmen Mountain thrust belt. Each thrustfault is such as composed of several secondary faults, Qingchuan （青川）-Maowen （茂汶） fault zone is composed of Qiaozhuang （乔庄） fault, Qingxi （青溪） fault, Maowen fault, Ganyanggou （赶羊沟） fault, etc.. The Longmen Mountain thrust belt experienced early Indosinian movement, Anxian （安县） movement, Yanshan （燕山） movement, and Himalayan movement, and the faults formed gradually from north to south.

关键词： Longmen Mountain thrust belt characteristics of fault fault grade evolution of fault

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Numerical modeling of the critical pipeline inclination for the elimination of the water accumulation on the pipe floor in oil-water fluid flow

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Petroleum 2021年第2期7卷 209-221页

作者： Xiaoqin Song Dongxin Li Xiao Sun Xingjie Mou Y.Frank Cheng Yuexin Yang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Petrochina southwest Pipeline company Chengdu610500China Downhole Operation company Sinopec Xinan Oilfield Service CorporationDeyang618000China Dept.of Mechanical Engineering University of CalgaryCalgaryABT2N 1N4Canada Civil Aviation Flight University of China Guanghan618307China

In this work,numerical models were developed to investigate the critical inclination of a pipeline to eliminate the water accumulation at the floor of the pipe carrying oil-water *** fluid dynamics software was used to establish a geometric model of the pipe with various inclination angles,and a grid-independent verification was conducted to determine a reasonable meshing *** relationships were determined between the pipe inclination angle and the affecting factors including the flow velocity,viscosity and the pipe diameter,where the water accumulation would not be able to ***,the critical inclination angle increases with the fluid flow *** refluxing of water is the key mechanism causing the water accumulation at the bottom of the *** addition to the fluid flow velocity,an increase in fluid viscosity and a decrease in the pipe diameter cause an increase of the critical inclination angle that the water phase can be carried away by *** model can be used to determine the critical inclination of pipelines carrying oil-water fluid to cause the water accumulation and the operating conditions that can eliminate the accumulation of water phase at the pipe floor.

关键词： Pipeline inclination Oil-water fluid flow Water accumulation Numerical modeling

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Progress and development directions of stimulation techniques for ultra-deep oil and gas reservoirs

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Petroleum Exploration and Development 2021年第1期48卷 221-231页

作者： LEI Qun XU Yun YANG Zhanwei CAI Bo WANG Xin ZHOU Lang LIU Huifeng XU Minjie WANG Liwei Li Shuai PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China PetroChina southwest Oil&Gasfield company Chengdu 610051China PetroChina Tarim Oilfield company Korla 841000China

By reviewing the development history of stimulation techniques for deep/ultra-deep oil and gas reservoirs,the new progress in this field in China and abroad has been summed up,including deeper understanding on formation mechanisms of fracture network in deep/ultra-deep oil and gas reservoir,performance improvement of fracturing fluid materials,fine stratification of ultra-deep vertical wells,and mature staged multi-cluster fracturing technique for ultra-deep and highly deviated wells/horizontal *** light of the exploration and development trend of ultra-deep oil and gas reservoirs in China,the requirements and technical difficulties in ultra-deep oil and gas reservoir stimulation are discussed:(1)The research and application of integrated geological engineering technology is difficult.(2)The requirements on fracturing materials for stimulation are high.(3)It is difficult to further improve the production in vertical profile of the ultra-deep and hugely thick reservoirs.(4.The requirements on tools and supporting high-pressure equipment on the ground for stimulation are high.(5)It is difficult to achieve efficient stimulation of ultra-deep,high-temperature and high-pressure wells.(6)It is difficult to monitor directly the reservoir stimulation and evaluate the stimulation effect accurately after *** line with the complex geological characteristics of ultra-deep oil and gas reservoirs in China,seven technical development directions are proposed:(1)To establish systematic new techniques for basic research and evaluation experiments;(2)to strengthen geological research and improve the operational mechanism of integrating geological research and engineering operation;(3)to develop high-efficiency fracturing materials for ultra-deep reservoirs;(4.to research separated layer fracturing technology for ultra-deep and hugely thick reservoirs;(5)to explore fracture-control stimulation technology for ultra-deep horizontal well;(6)to develop direct monitoring tec

关键词： ultra-deep oil and gas reservoir high temperature and high pressure reservoir stimulation technical status technical difficulties development direction

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Control of strike-slip faults on Sinian carbonate reservoirs in Anyue gas field, Sichuan Basin, SW China

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Petroleum Exploration and Development 2023年第6期50卷 1282-1294页

作者： HE Xiao TANG Qingsong WU Guanghui LI Fei TIAN Weizhen LUO Wenjun MA Bingshan SU Chen State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China PetroChina southwest Oil&Gas Field company Chengdu 610051China School of Geosciences and Technology Southwest Petroleum UniversityChengdu 610500China

The largest Precambrian gas field (Anyue gas field) in China has been discovered in the central Sichuan Basin. However, the deep ancient Ediacaran (Sinian) dolomite presents a substantial challenge due to their tightness and heterogeneity, rather than assumed large-area stratified reservoirs controlled by mound-shoal microfacies. This complicates the characterization of “sweet spot” reservoirs crucial for efficient gas exploitation. By analyzing compiled geological, geophysical and production data, this study investigates the impact of strike-slip fault on the development and distribution of high-quality “sweet spot” (fractured-vuggy) reservoirs in the Ediacaran dolomite of the Anyue gas field. The dolomite matrix reservoir exhibits low porosity (less than 4.) and low permeability (less than 0.5×10^(-3) μm^(2)). Contrarily, fractures and their dissolution processes along strike-slip fault zone significantly enhance matrix permeability by more than one order of magnitude and matrix porosity by more than one time. Widespread “sweet spot” fracture-vuggy reservoirs are found along the strike-slip fault zone, formed at the end of the Ediacaran. These fractured reservoirs are controlled by the coupling mechanisms of sedimentary microfacies, fracturing and karstification. Karstification prevails at the platform margin, while both fracturing and karstification control high-quality reservoirs in the intraplatform, resulting in reservoir diversity in terms of scale, assemblage and type. The architecture of the strike-slip fault zone governed the differential distribution of fracture zones and the fault-controlled “sweet spot” reservoirs, leading to wide fractured-vuggy reservoirs across the strike-slip fault zone. In conclusion, the intracratonic weak strike-slip fault can play a crucial role in improving tight carbonate reservoir, and the strike-slip fault-related “sweet spot” reservoir emerges as a unique and promising target for the efficient development of deep hydrocarbo

关键词： pre-Cambrian strike-slip fault carbonate reservoir fracturing controlling factor Sichuan Basin

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