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JournalISSN: 1673-1506

China offshore Oil and Gas 

About: China offshore Oil and Gas is an academic journal. The journal publishes majorly in the area(s): Source rock & Hydrocarbon exploration. Over the lifetime, 159 publications have been published receiving 593 citations.

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Journal Article
TL;DR: Baiyun deep-water area is quite complex and unique in geology as mentioned in this paper, it was located in a Mesozoic tectonic weak zone of subduction and a Cenozoic transfer zone between a thinned crust of oceanic-continental transition and a basin tectonics.
Abstract: Baiyun deep-water area is quite complex and unique in geologyThere is a particular setting of tectonic evolution because it was located in a Mesozoic tectonic weak zone of subduction and a Cenozoic tectonic transfer zone between a thinned crust of oceanic-continental transition and a basin tectonicsAfter a depositional evolution history of "rifting,fault-sagging and sagging",a three-level framework of basins was formed in the areaSince Oligocene,a continuous subsidence due to the spreading of South China Sea has resulted in stepped transgression sea level changes contrary to the global relative change of sea level and a generally fining-upward depositional sequenceDuring Oligocene,Baiyun area was a continental shelf,with delta sediments developedAfter a major tectonic event at the latest Oligocene(about 238 Ma),Baiyun area changed into a deep slope where the large dee-water fan system of Pearl River formedAll these geologic conditions have undoubtedly control and affect tectonic evolution,depositional filling and hydrocarbon accumulation in the areaTherefore,collect knowledge of the basic geology in Baiyun area may be helpful to oil and gas exploration in deep-water areas

56 citations

Journal Article
TL;DR: In this paper, the authors considered that the oil and gas distribution in the region is controlled by the hydrocarbon-generation sags( subsags), the areal zonation of hydrocarbon distribution results from the differences in source rocks and their thermal evolution, and the composite accumulation of hydrocarbons is caused by a compound system of migration and the late tectonic movements.
Abstract: In the eastern Pearl River Mouth basin,the regional tectonic evolution from the early riftting to the late depressing has resulted in a dual configuration of basin,the sedimentary sequence from the early nonmarine facies to the late marine facies has formed various assemblies of sedimentary facies,and the southward gradual thinning of the crust has led to an uneven thermal evolution in multiple depressed zones. In this distinct geological background,several sets of source rocks developed during multiple episodes of basin forming,two reservoir-seal combinations of nonmarine and marine facies formed in the riftting and depressing stage respectively, and various types of composite traps occurred due to multiple tectonic events, resulting in a hydrocarbon distribution of"north oil and south gas"around the rich hydrocarbon-generation sags( subsags) and a type of composite accumulation in the second-order structural belts. According to a comprehensive study, it could be considered that the oil and gas distribution in the region is controlled by the hydrocarbon-generation sags( subsags),the areal zonation of hydrocarbon distribution results from the differences in source rocks and their thermal evolution, and the composite accumulation of hydrocarbon is caused by a compound system of migration and the late tectonic movements. Based on the hydrocarbon distribution and accumulation pattern,the next exploration should be deployed around the rich hydrocarbon-generation sags( subsags). For the proven sags( subsags),the conception of duplex exploration should be kept as a guide,in order to achieve the three-dimensional and saturated exploration in the second-order structural belts. For the potential sags( subsags),it is needed to start from the regional geological study, evaluate systematically their hydrocarbon resources, select the best second-order structural belts and make the exploration breakthrough in new areas.

56 citations

Journal Article
TL;DR: Wang et al. as mentioned in this paper proposed two sets of major source rocks generally developed in these sags, i.e., the central canyon structural-litholigic trap zone and the central anticline zone in Changchang sag, and selected two preferetial plays for exploration.
Abstract: Under the control of several Cenozoic tectonisms,such as the continental margin extension,India-European plate collison and the seafloor spreading in South China sea,Qiongdongnan basin has undergone multiple stages of structural evolution,resulting in a tectonic framework with multiple uplifts and sags.In the deep-water area of this basin,there are 6 major negative structure units,including Ledong sag,Lingshui sag,Beijiao sag,Songnan sag,Baodao sag and Changchang sag,and 3 major positive units,i.e.Lingnan low-uplift,Songnan low-uplift and Beijiao uplift.According to a research on sequence stratigraphy and sedimentary facies and an analysis of hydrocarbon accumulation conditions,it may be concluded that there are two sets of major source rocks generally developed in these sags,i.e.Eocene lacustrine mudstone and Oligocene Yacheng Formation mudstone of coastal plain-semi-enclosed neritic facies;two regional reservoir-seal assemblages in Oligocene Lingshui Formation and Miocene Sanya Formation,and five types of reservoir,such as littoral sandstone,fan delta sandstone,basin fan sandstone,central channel sandstone and reef(biogenic beach) limestone,forming 6 favoralbe structural zones composed of medium-large anticline traps,faulted anticline traps and large stratigraphic-lithologic traps in the deep-water region.Based on these conclusions,four petroleum systems with a hydrocarbon kitchen each respectively in Lingshui,Baodao,Beijiao and Changchang sag are identified,and two favorable structural zones,i.e.the central canyon structural-litholigic trap zone and the central anticline zone in Changchang sag,are selected as the preferetial plays for exploration.Therefore,Lingshui X-1 and Changchang Y-1 prospects should be taken as the breakthrough points,and the two preferetial plays should be anatomized to promote hydrocarbon exploration in the region.

23 citations

Journal Article
TL;DR: Wang et al. as discussed by the authors used the tools of depositional facies, seismic facies and organic facies to predict the distribution of the major gas source rocks in Yacheng Formation, and the results have indicated that the source rocks are more widely developed in the central depression, especially in Baodao,Lingshui,Ledong、Changchang and Beijiao sags.
Abstract: In the deep water area of Qiongdongnan basin,the geochemical data in exploration wells and seismic records show that two sets of source rocks are developed in its central depression,i.e.Eocene lacustrine facies and Oligocene marine-coastal plain facies,in which the coal-bearing source rock of coastal plain facies in Oligocene Yacheng Formation is excellent in gas generation capacity due to its high content of terrigenous organic matter.The source rock of semi-isolated shallow marine facies in Yacheng Formation is mostly between 0.5% and 1.5% in TOC(total organic carbon) and predominated by humic kerogen,with its distribution area and volume quite great.Because of limited drilling data in the deep water area,the tools of depositional facies,seismic facies and organic facies were comprehensively used to predict the distribution of the major gas source rocks in Yacheng Formation,and the results have indicated that the source rocks in Yacheng Formation are more widely developed in the central depression,especially in Baodao,Lingshui,Ledong、Changchang and Beijiao sags.The modeling experiments of gas generation under high temperature and pressure have suggested that the higher geothermal gradient in the central depression could accelerate gas generation,and that the widespread Oligocene overpressure in the depression might restrain early gas generation to a certain degree and promote later gas generation,resulting in the expanding of gas window and gas exploration play.Furthermore,the source rocks of Eocene lacustrine facies could generate oil early and produce oil-cracked gas lately due to their deep burial.Therefore,the main sags in the deep water area are higher in gas generation capacity and good in gas exploration potential.

22 citations

Journal Article
TL;DR: In this article, an idea from "source" to "sink" was firstly applied to the sedimentary system in rifted lake basins, and it was considered that the entire dynamic process from sediment erosion,transportation to accumulation should be seen as a complete sourcesink system to discuss the sand enrichment mechanism.
Abstract: As a study case in Bohai water,an idea from "source" to "sink" was firstly attempted to be applied to the sedimentary system in rifted lake basins,and it was considered that the entire dynamic process from sediment erosion,transportation to accumulation should be seen as a complete sourcesink system to discuss the sand enrichment mechanismA sand enrichment area often corresponds to a complete time-space coupling system of sourcesink in any complex continental rift basin,and a time-space coupling system of source-sink generally includes three sub-systems,namely effective provenance sub-system,effective accumulation sub-system and base-level conversion sub-systemThe effective provenance sub-system can be divided into the explicit and implicit types,and the implicit type can be again divided into the time-implicit provenance system and space-implicit provenance systemIt is of great significance in reservoir prediction to identify the implicit provenance systems in a continental rift basinThe effective accumulation sub-system is composed of some sediment transport channels,slope break zones and detritus accommodation spaceThe base-level conversion sub-system will mainly control the period of sandbody development in a sequenceThe complex tectonic evolution in Bohai water has resulted 7 controlling sand models of source-sink coupling in time and space,including the corner-style source-sink system along basin margin faults,the strike-slope-style source-sink system along basin margin faults,the opposite-consumption-style source-sink system along basin margin faults,the valley-style sourcesink system along basin margin faults,the strikeslip fault source-sink system along basin margin,the valley-style source-sink system along uplift axes and the valley-style source-sink system on rampsThe exploration results have indicated that the controlling sand idea of source-sink coupling in time and space can significantly improve the success rate of Paleogene reservoir prediction in Bohai water,making great contributions to promoting the Paleogene explorationThis idea will also be an important reference for sedimentary system analysis and reservoir prediction in other similar basins

20 citations

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No. of papers from the Journal in previous years
YearPapers
20154
201414
201312
201227
201115
201016