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Heterogeneous characteristics of various lamina assemblage in shale of Shahejie Formation of the Zhanhua Sag， bohai Bay Basin， eastern China

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Journal of Earth Science 2024年

作者： Xiaolin Wang Xiaomin Zhu Jin Lai Xingyue Lin Yushan Du Yurui Zhu National Key Laboratory of Petroleum Resources and Engineering， China University of Petroleum College of Geosciences， China University of Petroleum Beijing Sinopec Shengli Oilfield company

The Eocene Shahejie Formation in the Zhanhua Sag of the bohai Bay Basin has abundant shale oil resources. However， lacustrine shale is heterogeneous in mineralogy， sedimentary structure， organic matter， pore structure， paleoenvironment， and oil content. Therefore， the laminae assemblages are divided into laminated （lamina thickness of 0.1 m） types shale to investigate the core， X-ray diffraction （XRD）， thin section， field emission-scanning electron microscopy （FE-SEM）， mercury injection capillary pressure （MICP）， N2adsorption and geochemical experiments. The results show that the oil shale of Shahejie Formation in Zhanhua Sag is abundant in calcite. The TOC content ranges between 1.35% and 5.55%. Rock-Eval S1and S2values range from 0.30 to 2.56 mg/g and 0.97～15.47 mg/g， respectively. Variable kinds of nanopores， micropores， and microfractures are commonly observed. The connectivity of pores in laminated and layered shale samples is relatively better than massive shale. The massive shale was formed in a sedimentary environment with warm and humid climate， moderate salinity， weak reduction conditions， high productivity， and paleo-setting rate. Organic matter is derived from lower bacteria， algae， and terrigenous plants. Laminated and layered shale are formed in an arid and cold environment with high salinity， strong reducibility， low paleo-setting rate. Laminated shale is located on a gentle slope at the basin margin， which is the focus of shale oil exploration because of their higher hydrocarbon generation potential， reservoir quality， and advantaged horizontal fracturing conditions. The above results have implication for the sweet spots prediction in shales with similar geological setting.

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Paleosalinity reconstruction in offshore lacustrine basins based on elemental geochemistry:a case study of Middle Upper Eocene Shahejie Formation,Zhanhua Sag,bohai Bay Basin

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Journal of Oceanology and Limnology 2024年第4期42卷 1087-1105页

作者： Long SUN Shenghe WU Dali YUE Wenfu CUI National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Shengli Oil Production Plant Shengli Oilfield CompanySINOPECDongying 257400China

Salinity is a crucial property of water body and is essential for the restoration of paleoecology and ***,the theoretical method of application of elemental geochemical proxies to paleosalinity reconstruction is still ***,accurate determination and reconstruction of paleosalinity and its variation in an offshore lacustrine basin have been extremely challenging thus *** study presents detailed elemental geochemical investigations from the Zhanhua Sag in the southern bohai Bay Basin to reconstruct the salinity variation in the Paleogene Eocene Shahejie Formation(50.8-33.9 Ma).Based on the variation of strontium barium ratio(Sr/Ba)and boron gallium ratio(B/Ga),we determined three typical salinity types of water body:salty water(Sr/Ba>0.5,B/Ga>6),brackish water(0.2

关键词： paleosalinity paleoclimate Zhanhua Sag Middle-Upper Eocene Shahejie Formation

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The contribution of bacteria to organic matter in coal-measure source rocks

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Acta Geochimica 2019年第3期38卷 364-375页

作者： Qingsong Cheng Min Zhang Guanghui Huang Wenjun Zhang College of Resources and Environment Yangtze University Key Laboratory of Exploration Technology for Oil & Gas Research (Yangtze University) Ministry of Education bohai Petroleum Research Institute CNOOC (China) Co.Ltd.Tianjin Branch

On the basis of GC–MS analysis, a suite of nine coal-measure source rocks(Ro 0.51%–0.63%) from the southern margin of Junggar basin was found to contain many biomarkers for bacterially-generated hydrocarbons:hopane, sesquiterpene, C_(23)+ monomethyl alkanes(even carbon predominance), and C_(24)+ alkyl ***–eval and microscope analysis indicate that vitrinite(especially desmocollinite and homocollinite) plays a significant role in the generation of hydrocarbons in coalmeasure source rocks. Vitrinite performs this role by absorbing ultramicroscopic organic matter, generally in the form of resins or bacterial plastids. C_(23)+ monomethyl alkanes(even carbon predominance) and C_(24)+ alkyl cyclohexane series compounds are derived from bacterial metabolites of higher plants. The ultramicro organic matter adsorbed by vitrinite source rocks in the study area is probably ultramicro bacterial plastids. Because the organic matter of higher plants with low hydrogen content has been transformed into organic matter rich in hydrogen by bacteria, the hydrocarbon generation capacity of source rocks is greatly improved. In other words, in coal-measure source rocks, bacteria play an important role in hydrocarbon generation.

关键词： Coal-measure source rocks Organic matter type Bacteria Monomethyl alkanes Alkyl cyclohexane

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Major controlling factors and hydrocarbon accumulation models of large-scale lithologic reservoirs in shallow strata around the Bozhong sag,bohai Bay Basin,China

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Petroleum Exploration and Development 2022年第4期49卷 758-769页

作者： ZHOU Xinhuai WANG Deying YU Haibo YANG Haifeng LI Long Hainan Branch of cnooc Ltd Haikou 570100China Tianjin Branch of cnooc Ltd Tianjin 300459China

Based on the practice of oil and gas exploration and the analysis of shallow lithologic reservoirs,combined with the allocation relationship and enrichment law of oil and gas accumulation factors,main controlling factors and models of hydrocarbon accumulation of large lithologic reservoirs in shallow strata around the Bozhong sag are summarized,and favorable exploration areas are *** coupling of the four factors of“ridge-fault-sand-zone”is crucial for the hydrocarbon enrichment in the shallow lithologic *** convergence intensity of deep convergence ridges is the basis for shallow oil and gas enrichment,the activity intensity of large fault cutting ridges and the thickness of cap rocks control the vertical migration ability of oil and gas,the coupling degree of large sand bodies and fault cutting ridges control large-scale oil and gas filling,the fault sealing ability of structural stress concentration zones affects the enrichment degree of lithologic oil and gas *** enrichment models including uplift convergence type,steep slope sand convergence type and depression uplift convergence type are established through the case study of lithologic reservoirs in shallow strata around the Bozhong sag.

关键词： shallow lithologic reservoir main controlling factors convergence ridge accumulation model Bozhong sag bohai Bay Basin

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Risk assessment of fault reactivation considering the heterogeneity of friction strength in the BZ34-2 Oilfield,Huanghekou Sag,bohai Bay Basin,China

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Petroleum Science 2023年第5期20卷 2695-2708页

作者： Ye-Jun Jin Ling-Dong Meng Ding-You Lyu Xiao-Fei Fu Jiang-Bo Huang Si-Jia Cao Jian-Da Li School of Earth Sciences Northeast Petroleum UniversityDaqing 163318HeilongjiangChina Key Laboratory of Oil&Gas Reservoir and Underground Gas Storage Integrity Evaluation of Heilongjiang Province Northeast Petroleum UniversityDaqing 163318HeilongjiangChina bohai Rim Energy Research Institute Northeast Petroleum UniversityQinhuangdao066004HebeiChina cnooc Tianjin company Tianjin 300459China

The hazards of fault reactivation caused by fluid injection are a growing ***,traditional evaluation methods of fault stability are likely to underestimate the risk in fault segments with a high clay ***,an extended evaluation method of fault stability(ECPP)incorporating the heterogeneity in friction strength caused by variation in the clay content within the fault zone is established in this *** characterizing the current stress field of the BZ34-2 Oilfield in the Huanghekou Sag,bohai Bay Basin,the reactivation potential of faults is evaluated using both traditional and ECPP *** evaluation of fault stability shows that all faults are stable in the present stress *** oriented ENE have a relatively high *** maximum sustainable fluid pressure Δp is approximately 8.8-8.9 MPa and 9.3-9.9 *** considering the heterogeneity in fault friction strength,the fault stability is clearly controlled by the clay content of the *** high-risk fault segments assessed using traditional methods are no longer obvious,which reflects the importance of incorporating friction strength heterogeneity in the process of fault ***,the results also show that most fault segments are activated when the fault zone is dominated by montmorillonite,reflecting the strong influence of clay mineral types on fault *** factors influencing the heterogeneity of fault friction strength are very complicated in actual ***,future work should focus on establishing a database through a large number of experiments and investigating the relationship between the friction coefficient and the main controlling factors.

关键词： Faultreactivation In-situ stress Strength heterogeneity of fault friction Huanghekou Sag

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ELECTROCHEMICAL MEASUREMENT OF STEEL CORROSION IN SEABOTTOM SEDIMENT WITH “MD” METHOD

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Chinese Journal of Oceanology and Limnology 1996年第2期14卷 154-159页

作者：马士德李言涛谢肖勃郑国安常伟栗艳侠 Institute of Oceanology Chinese Academy of Sciences Qingdao Engineering and Design company Bohai Oil Corp Tanggu

The tbough one year cormsion potential and polarisation resistanoc for 3 kinds of stals in seabottomedment of Liaodong Bay were measured with the “MD” *** measurements wiIl have some thoretical and pndital talues. The thooretical valoc lies in thatthe reoorded changing process of the practital corrosion case can be basis for indoor discussion andeectrochemical on the corrosion practical value lies in that the obtained datu canbe basis for designing and controlling elatrochemical protation syttems. In fact, it is very difficult tomeasure in situ the cornosion parnders of steeIs in sea sediment.

关键词： corrosion potential polariiBtion resistance seabottom sediment

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Fine anatomy of reservoir architecture of point bar in meandering river: a case study of Minghuazhen Formation in northern block of Q oilfield,bohai Sea

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Global Geology 2014年第4期17卷 218-224页

作者： MENG Peng HU Yong bohai Oilfield Research Institute Tianjin Branch of CNOOC Ltd

In order to solve dynamic Problems caused by the internal structure of fluvial reservoir,it is necessa-ry to study the fine anatomy of Point bar. Taking Minghuazhen Formation in the northern block of Q oilfield, bohai Sea as an examPle,the authors studied identification marks,distribution Pattern and scale of Point bar based on coring,logging and dynamic data. The results show that the length of Point bar and the width of lateral accretion body are 713-911 m and 71-111m,resPectively;the diP angle and the thickness of lateral accretion bedding are 3. 5o-5. 9o and 0. 1-0. 5 m. The lateral accretion beddings are the key factor affecting the seePage velocity of the tracer.

关键词： reservoir architecture lateral accretion body point bar meandering river Q oilfield bohai Sea

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Study on Injection-Production System Adjustment of Fault Block Reservoir Based on Equilibrium Displacement

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Open Journal of Yangtze Oil and Gas 2020年第2期5卷 35-45页

作者： Ming Yang Cunliang Chen Yu Wang Xiaohui Wu Dong Ma bohai Petroleum Research Institute Tianjin Branch of CNOOC Tianjin China

This paper proposed a method of injection-production system adjustment to solve the problem that the water flooding effect was restricted because of the horizontal and vertical contradictions during the development process of fault block reservoirs. Considering the heterogeneity of reservoir, the Buckley-Leverett water flooding theory was applied to establish the relationship between the recovery and cumulative water injection. In order to achieve the goal of vertically balanced recovery of each section, the calculation method of vertical sectional injection allocation was proposed. The planar triangular seepage unit was assumed and sweep coefficients of different oil-water distribution patterns were characterized using multi-flow tube method. In order to balance and maximize the plane sweep coefficient, the calculation method of plane production system optimization was obtained. Then the injection-production system stereoscopic adjustment method based on equilibrium displacement was proposed with vertical sectional injection allocation and plane production system optimization. This method was applied to injection and production adjustment of BZ oilfield in southern bohai. The effect of water control and oil increase was obvious. This method can greatly improve the effect of water flooding of offshore fault block reservoirs with the adjustment of injection-production system.

关键词： Fault Block Reservoir Equilibrium Displacement Vertical Sectional Injection Allocation Planar Production System Optimization Adjustment of Injection-Production System

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Paleosalinity and Its Association with Organic Matter: A Case Study from the Eocene Shahejie Formation, Laizhou Bay Sag, bohai Bay Basin (China)

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Journal of Ocean University of China 2021年第4期20卷 741-754页

作者： LIANG Haoran XU Guosheng YU Qing XU Fanghao WANG Deying CHEN Zhiyuan State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China bohai Oilfield Research Institute Tianjin BranchCNOOC Ltd.Tianjin 300459China Shanghai Branch CNOOC Ltd.Shanghai 200335China Research Institute of Petroleum Exploration and Production Southwest Petroleum BranchSINOPECChengdu 610041China

Paleosalinity is vital for the paleoenvironmental reconstruction and affects the formation of source *** lower-middle sections of the third member of Eocene Shahejie formation(Es3M-L)constitute the most important source rock layer in Laizhou Bay ***,the paleosalinity of the depositional water in which Es3M-L submembers are deposited remains unclear.A series of integrated experiments,including major and trace elements,X-ray diffraction,total organic carbon,and Rock-Eval,was performed to reveal the paleosalinity and its relationship with organic matter(OM).Various inorganic proxies(Sr/Ba,Rb/K,B/Ga,Walker’s paleosalimeter,Adam’s paleosalimeter,and Couch’s paleosalimeter)were employed to determine the paleosalinity of *** differences existed in the ***’s paleosalimeter is the most reliable and qualitative approach for Laizhou Bay *** from the lake center(depocenter)and margin showed paleosalinities from 4.92 wt‰to 9.73 wt‰,suggesting a ubiquitous brackish(oligohaline-mesohaline)water body in the *** enrichment in samples indicates an oxygen-depleted(suboxic or anoxic)*** increase in salinity has a certain but non-significant positive correlation with oxygen *** condition may be attributed to the weak stratification of the water column in brackish water ***,paleosalinity has a weak and indirect relationship with OM accumulation during the deposition of Es3M-L submembers in Laizhou Bay Sag.

关键词： paleosalinity Laizhou Bay Sag Shahejie formation brackish lake major and trace elements

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Research on Thin Layer Structure Identification and Sedimentary Facies of Middle and Deep Layers Based on Reflection Coefficient Inversion—By Taking Dongying Formation of CFD Oilfield in bohai Offshore as an Example

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Open Journal of Geology 2021年第6期11卷 197-209页

作者： Wentong Zhang Qing Zhou Wei Yang Jiaguo Ma Jie Tan bohai Oilfield Research Institute CNOOC Ltd.-Tianjin Tianjin China

The sand layer B of Dongying Formation of CFD oilfield in bohai offshore belongs to the middle deep layer of buried hill overlap deposit. Its reservoir distribution has the characteristics of large burial depth, thin thickness and rapidly lateral change. Because of low resolution of seismic data and overlying sand layer. It is difficult to identify and interpret the structure of sand layer accurately. The uncertainty of structure and reservoir restricts the fine development of B sand layer. In order to identify the top surface of reservoir effectively. The seismic data are processed by using the reflection coefficient inversion method. The results show that the inversion resolution of reflection coefficient is significantly higher than that of original data. The top surface of sand layer B and its overlying sand layer can be well identified and traced. Carrying out structural interpretation of B sand layer based on reflection coefficient inversion data and the microstructure and the formation tip extinction point are implemented. Based on the constraint of new interpretation level, the sedimentary facies plane distribution of B sand layer is described and make prediction of dominant reservoir development area in detail combining with sedimentary paleogeomorphology, along layer attribute section and limited drilling data. The research shows that the study area is mainly from the northwest material sources, the slope belt in the northwest is close to the lake shoreline with a gentle slope and shallow water depositional environment, which is located on the main transport and deposition channels. The shallow water gentle slope landform is suitable for forming large-area sand bar deposition, mainly composed of underwater distributary channel and debouch bars facies, which is the dominant reservoir development area. The research conclusion guides the deployment and implementation of the development well location effectively.

关键词： Middle Deep Layer Braided River Delta Reflection Coefficient Inversion Paleogeomorphology Sedimentary Facies

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