学位专题

目录>
  • 封面
    英文文摘
    1 Introduction
    1.1 Project Foundation and Significance
    1.2 Research and Development on lithostratigraphic Hydrocarbon Reservoirs
    1.2.1 Overseas Research
    1.2.2 Domestic Research
    1.2.3 Lithological Traps Recognition Technologies at Home and Abroad
    1.3 Research Content and Technique Course
    1.3.1 Research Contents
    1.3.2 Technique Course
    1.4 Main Research Results and Technique Innovation
    1.4.1 The Main Works Completed
    1.4.2 Technique Innovation
    2 Geologic Features for Southwest Chaidamu Basin
    2.1 Introduction
    2.2 Structure Evolution
    2.3 The Analysis for Palaeo-Tectonic Features
    2.3.1 Significance
    2.3.2 The Palaeo-Tectonic Recovering
    2.3.3 Palaeo-Tectonic Features and its Relations with LithostratigraphicTraps
    2.4 Strata Development Features and Sequence Stratigraphics Features
    2.4.1 Strata Development Features
    2.4.2 Sequence Stratigraphics Feature
    2.4.3 The Relations between Sequences and Lithoiogy Hydrocarbon Reservoirs
    2.5 Depositional Reservoir Features
    2.5.1 A Comprehensive Analysis of Sediment Sources
    2.5.2 Sedimentary Facies within an Isochronous Sequence Framework
    2.5.3 Depositional Feature and Benefit Region Distribution for Lithology Hydrocarbon Reservoir
    2.6 Characteristics of Reservoir-Cap Combination
    2.7 Main hydrocarbon reservoirs Types
    2.8 Summary
    3 Key Techniques for Lithostratigraphic Traps Seismic Identification
    3.1 The Prediction for The Delta Plain-From Sandbodies
    3.1.1 Reservoirs Feature
    3.1.2 The Basis Theory for Multi-Wavelet Seismic Trace Decomposition
    3.1.3 Reservoir Analysis Using Seismic Trace Reconstruction
    3.1.4 The Reservoir Prediction Using Seismic Trace Waveform Decomposition
    3.1.5 Analyzing Hydrocarbon Using Wavelet Spectrum Attenuation
    3.2 The Good Reservoir Prediction of Beach Bar Sand and Sheet Sand
    3.2.1 Reservoir Features and Geophysical Response Features
    3.2.2 Thick Reservoir Prediction in Beach Bar Sand
    3.2.3 Prediction of Sands with High Porosity and Permeability
    3.2.4 Hydrocarbon Prediction
    3.3 The Identification of Fans Related to Slope-Broken Area
    3.3.1 Geologic Features and Seismic Features
    3.3.2 The Fans Development Area Determination Through Analyzing Pa Structure Background
    3.3.3 The Fans Identification Using Seismic Section,Slice Extracted Along Horizons and Phase Sections
    3.3.4 The Fan Patterns Description Using Property Features
    3.4 The Stratigraphic Analysis Developing Up and Down the Unconformity
    3.4.1 The Section Feature for Stratigraphic Traps
    3.4.2 The Pinchout Boundary Determination Using Coherence Strengthening(Weakening)
    3.4.3 The Pinch-Out Line Identification Using Peak(Valley)Numbers
    3.4.4 The Thickness Quantitative Analysis for Sandy Glutenitet
    3.5 Conclusions
    4 The Study for"Four Determinations and One Optimization"
    4.1 The Determination of Favorable Trap Development Area Through Analyzing Palaeo Structure
    4.2 The Determination of Vertical Favorable Area by The Sequence Stratigraphic Study
    4.3 The Determination of Reservoir Development Discipline by Sedimentary Facies Study
    4.4 The Identification and Determination of Traps by Seismic Techniques
    4.5 The Comprehensive Evaluation and Target Optimization
    4.6 Summary
    5 The Exploration Effect,Technique Application and Exploration Cases
    5.1 The Exploration Effect
    5.2 Exploration Cases
    5.2.1 Stratigraphic Traps Exploration in Qie 16 Well Area
    5.2.2 Lithologic Traps Developing in Qi31 Well Area
    6 Conclusion and Suggestion
    6.1 Conclusion
    6.2 Suggestions
    Reference
    Acknowledgement
    Resume & The Published Thesises for Ph.D
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DOI:10.7666/d.y1828679

A Research on the Techniques for Identifying Lithologic Stratigraphic Traps in the Southwest 3D Survey of Chaidamu Basin

Chen Haiqing
中国海洋大学
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The Southwest Chaidamu 3D survey is located between Kunlun and Aerjinmountains in the south region of west Chaidamu basin, which had been proved to beone of the most promising areas in this basin. The survey area is situated at the edgeof the Basin. The sand bodies originated from Kunlun and Aerjin mountains are goodfor forming various kinds of lithologic stratigraphic traps. Nevertheless, the thinnessof oil-baring layers, severe facies change and the weak seismic or sonic responsescharacterized by this area are the geological factors that hinder the exploration oflithologic stratigraphic reserviors. And what is more, the lack of effective geophysicaltechniques and systematical research strategy is one of the most important reasons. Aiming at the geological characteristics and the current exploration situation inthe Southwest Chaidamu 3D survey area, lithologic stratigraphic reservioridentification and analysis work was conducted. During the research, thecontemporary tectonics and tectonic evolution had been studied to analyze arelationship between tectonics activity and lithologic traps fonm and development. The study of palaeo-structure not only provide the foundation for thestratigraphic sequence model building and, systems tract deposition model divisionand the establishment of facies classification, but importantly determine a favorablezone for the identification of lithologic and stratigraphic traps. An isochronous stratigraphic framework was established through the study ofsequence stratigraphy in the study area. The sequence developing at Tertiary in studyarea was divided into three Ⅱ sequences and sevenⅢsequences. Several favorablelithologic stratigraphic zones had been found and determined variable traps to makeclearly next research. Different sedimentary facies types had been found through studying sedimentaryfacies. The various cycles of reservoirs distribution and reservoirs nature had beendetermined and then provided evidence for finding high quality good reservoir. The identification techniques and methods had been studied for lithologicstratigraphic traps to establish models of identification and analysis for SouthwestChaidamu Basin exploration basing on geophysical analysis. And the better effect hadbeen obtained in practice. The targets had been optimized to provide drilling suggestion basing onfavorable zones and lithostratigraphic traps evaluation. The better effect and economiceffect had been achieved through drilling. Several innovations had been obtained through studying the project. 1 the theory and methods of "four determinations and one optimization" hadbeen proposed first theorically for lithostratigraphic strata study. In this project research, the theory of "four determinations and one optimization"had been first proposed theorically for lithologic traps study through analyzinglithologic stratigraphic trap geologic features, geophysical characteristics and seismicidentificaiton and analysis combining with traps geologic evaluation, which areconsisted by ancient structural analysis to determine trap favorable development areas,sequence stratigraphics study to determine the vertical favorable areas, sedimentaryfacies to find reservoir development law, seismic technology to identify and determinetraps and comprehensive evaluation and target optimization. Compared with conventional lithological trap identification methods, the methodof "four determination and one optimization" is to analyze ancient structure which isessential for lithologic reservoirs exploration. The results obtained in the practicalapplication were very good. During palaeo-structure study, the strata dip correction had first been proposed torecover the true strata thickness. At the same time the strata erosion thicknessrecovery method was first used to make maps of palaeo-structure in SouthwestChaidamu Basin. At present the sets of palaeo-structure maps had become essentialbasic maps and played an important role in ithostratigraphic reservoirs study. 2 four identificaiton models had been estabished first and the correspondingtechniques and methods had been developed. During the project implementation, on the basis of study of geologic features oflithologic stratigraphic traps, four identification models had Been establishedaccording to sedimentary enviornment, traps types, main controlling factors andgeophysical features. Each model had been used to identify and analyze thelithostratigraphic traps and the specific technique had been built for lithologic trapsidentificaiton. Four technical series had been developed,which are seismic reservoirprediction based on multiwavelet seismic trace decomposition, prediction of highquality reservoirs with great thickness and good physical property, fan bodiesidentification and shape configuring combining ancient structural analysis withseismic fades analysis, stratigraphic overlap line coherence strengthening andpea.k(trough) number technique and quantitative analysis of glutenite thickness.Among these techniques, the fan bodies identification and shape configuringcombining ancient structural analysis with seismic facies analysis and stratigraphicoverlap line coherence strengthening and peak(trough) number technique were firstdeveloped and used. The seismic reservoir prediction based on multiwavelet seismictrace decomposition, prediction of high quality reservoirs with great thickness andgood physical property were also first used and proposed. 3 The significant exploration results had been otained through the techniquesapplication. The drilling results were great. In the project study and application, the rich geologic results and betterexploration effects had been obtained. In 2009 an oilfield with predicted reserves ofhundred million ton, which had been found in Kunbei area in Chaidamu Basin shouldbe contributed to lithologic and stratigraphic oil and gas reservoir studies, its reservewas accountedfor 43％ of total reserves. The theory and methods of "four determinations and one optimization" proposedin the project had not only been applied best to the area, but also to the west of theBasin and the margin of north Basin, which had showed a good promotional value. In the project study and application, the rich geologic results and betterexploration effects had been obtained. There were 137 lithostratigraphic traps havingbeen found in Southwest Chaidamu Basin 3D area with traps area of 946.41cm2. Theproposed well were 72, among which 53 wells were adopted, and 23 wells had drilledindustrial oil. The wells aimed had increased from 2-3 planed in 2006 to 27 planed in2009, which was occupied from 13.3％ to 70％. At same time when the project studied, the new discovered trap area was 94km2,the predicted hydrocarbon reserves was 5376×104t,the new controlled areabearing-hydrocarbon was 67.lkm2, the new controlled reserves was 3566×104t,thenew proven oil-bearing area of 44.85km2 and proven reserves was 2038.08×104t. This research project achieved the expected goals.

中国海洋大学

博士

Marine Geophysics

Liu Huaishan

2010

P618.13

2011-06-30（万方平台首次上网日期，不代表论文的发表时间）