Editorial Recommendation More Editorial Recommendations
Regional evaluation of oil and gas resources in offshore China and exploration of marine Paleo-Mesozoic oil and gas in the Yellow Sea and East China Sea
40 years have passed since the reestablishment of the Qingdao Institute of Marine Geology in 1979. In the past 40 years, following the basic objective to carry out public oil and gas surveys in China seas and global waters with the Yellow Sea and East China Sea as major targets so as to meet the increasing demand of energy resources of the nation and society, the institute has devoted a lot to the studies on hydrocarbon resource generation and distribution patterns in China seas, upon the international frontiers of marine science and technology. A great number of breakthroughs have been achieved, such as the discovery of new oil and gas horizons and districts. Under the guidance of national energy strategy and the task to make China a strong marine power, the Institute has persisted in regional evaluation of oil and gas resources in China seas, in particular in the Yellow Sea and East China Sea. The research can be roughly subdivided into three stages: the first stage focusing on comparison of offshore and neibouring basins; the second stage focusing on the study of regional evaluation strategies of China seas and the third stage focusing on new horizons and new districts in the Yellow Sea and East China Sea. A map series on distribution of sedimentary basins in China seas and a set of dynamic situation map of oil and gas exploration and development in China Sea were compared and published successively. During the period, following achievements are necessary to be mentioned: (1) Breakthroughs in early stage oil and gas evaluation technology and the deep seismic detection technology for offshore sedimentary basins; (2) Resource assessment in China seas. Data proves that China is rich in marine oil and gas. And the next cycle of survey and exploration should be placed in the new horizons, such as gas offshore, buried hills oil and gas resources in the hydrocarbon-rich sags, oil and gas in deepwaters, organic reefs in the South China Sea and unconventional gas; (3) Further understandings of basic geology, such as, basement properties, marine stratigraphic sequences, tectonic division, characteristics of Jurassic foreland basins, marine basin hydrocarbon geologic conditions and favorable zones in the South Yellow Sea basins; (4) Solution of some specific geological problems related to oil and gas accumulation. Such as, Mesozoic stratigraphic sequences, two-stage basin architecture, basin properties, Mesozoic stratigraphic distribution patterns and the discovery of " Great East China Sea”, Mesozoic hydrocarbon geologic conditions and favorable zones in the East China Sea; (5) Discovery of Paleozoic reservoirs. These achievements and discoveries have laid a solid foundation for the future oil and gas geological survey and exploration in China seas.
CHEN Jianwen, LIANG Jie, ZHANG Yinguo, YANG Changqing, YUAN Yong, XU Ming, WANG Jianqiang, LEI Baohua, LI Gan, YANG Yanqiu, YANG Chuansheng, SUN Jing
doi: 10.16562/j.cnki.0256-1492.2019112001
Marine Geology & Quaternary Geology.2019: 1-29
PDF XML Download
Editorial Recommendation More Editorial Recommendations
Tectono-sedimentary evolution of the Mesozoic in the southern East China Sea Shelf Basin and its bearing on petroleum exploration
The East China Sea Shelf Basin is located on the southeastern margin of the Eurasian Plate. Since Mesozoic, the formation and evolution of the basin are characterized by multiphase oceanic subduction of the Paleo-Pacific plate and superimposition of multistage tectonic systems. As the results, many questions, such as prototype of the basin, tectono-sedimentary evolution and hydrocarbon accumulation, have always remained in puzzle. Based on the latest seismic surveys and the drilling data from adjacent land areas, this paper is devoted to the key problems and exploration directions of the Mesozoic hydrocarbon accumulations, through sea-land correlation, establishment of Mesozoic sequence stratigraphy and remodeling of tectono-sedimentary evolution process. It is found that there are two super-sequences and seven seismic sequences in the Mesozoic in the basin. It was a passive continental margin before Late Triassic, an active continental margin depression in Late Triassic-Middle Jurassic, but a faulted basin on an active continental margin in Cretaceous. It is proposed that the basement of the basin in early stage was in NE direction which controls the framework of the Mesozoic basin and macroscopic hydrocarbon-bearing properties. Corresponding to the two-stages of tectonics, there are two sets of Mesozoic source-reservoir-caprock combinations. The Keelung movement, Yushan movement and Yandang movement dominated the formation and accumulation of early-stage oil and gas, while the Longjing movement contributed to the reform of oil and gas reservoirs. Inherited uplifts (slope), such as the Minjiang slope and the " uplifts in depressions” in the Taipei transitional zone, are the main petroleum exploration targets in the future to come.
YANG Changqing, YANG Yanqiu, YANG Chuansheng, SUN Jing, WANG Jianqiang, XIAO Guolin, WANG Jiao, WANG Mingjian
doi: 10.16562/j.cnki.0256-1492.2019070305
Marine Geology & Quaternary Geology.2019: 30-40
PDF XML Download
Editorial Recommendation More Editorial Recommendations
Seismic detection of deep structure for Southern Kyueshu-Palau Ridge and its possible implications for subduction initiation
The Kyushu-Palau Ridge (KPR) is an excellent place to study the initiation of plate subduction, and thus a unique natural laboratory for developing the plate tectonic theory. Based on a thorough review of literatures, we tried in this paper to reveal the solid vs. liquid structure of the lithosphere using the geophysical data by OBS and OBEM along a regional transection passing through the West Philippine Basin, the KPR, and the Perce-Vela basin. Combined with geochemical studies and computational geodynamic simulations, the characteristics of the deep subducted slabs, the different oceanic lithosphere, the corresponding magmatic activities and mechanism as well as the flux and cycling of the subducted materials are investigated. Upon the basis, a complete evolution model including subduction initiation, island arc splitting, and the back-arc seafloor spreading is proposed in this paper for the tectonic evolution of a subduction zone.
DING Weiwei, LI Jiabiao
doi: 10.16562/j.cnki.0256-1492.2019071601
Marine Geology & Quaternary Geology.2019: 98-103
PDF XML Download
Editorial Recommendation More Editorial Recommendations
Interaction between seafloor cold seeps and adjacent hydrothermal activities in the Okinawa Trough
As the seafloor extreme environmental systems, both hydrothermal vents and cold seeps are the critical pathways between the lithosphere and exosphere (biosphere, hydrosphere and atmosphere) for transfer and exchange of materials and energies. There are significant differences, but also many similarities between the two systems. Recent investigations show that in some special tectonic units, hydrothermal vents and cold seeps are not isolated from each other, but instead there are some interactions or coupling relationships in terms of tectonic geology, biological ecology and element cyclicity. As a typical back-arc basin in the western Pacific Ocean, there are abundant hydrothermal vents and cold seeps developed in the Okinawa Trough (OT). Therefore, it has become an ideal natural laboratory for studying the two extreme environmental systems and their interactions. On the basis of literature researches and careful field case studies, we investigate the material diffusion process and biogeochemical process between cold seeps and hydrothermal vents adjacent to each other within the trough. A conceptual model is then established for the interactions between the fluids from the two extreme systems. Our results suggest that it would help to establish a more complete model of the coupling relationship between the two systems in the future, if the structural development characteristics, pore fluid evolution, biological communities, and mineral chemistry of the two deep-sea extreme environments are systematically analyzed. Moreover, it will help to reveal the interaction between them in biological ecology and finally establish a model of interaction between hydrothermal vents and cold seeps on the basin scale, so as to better understand the interaction process between cold seeps and hydrothermal systems and even the coupling of " flow-solid” in the Western Pacific Ocean or the whole Earth.
WU Nengyou, SUN Zhilei, LU Jianguo, CAI Feng, CAO Hong, GENG Wei, LUO Min, ZHANG Xilin, LI Qing, SHANG Luning, WANG Libo, ZHANG Xianrong, XU Cuiling, ZHAI Bin, LI Xin, GONG Jianming, HU Yu, LIN Genmei
doi: 10.16562/j.cnki.0256-1492.2019070102
Marine Geology & Quaternary Geology.2019: 23-35
PDF XML Download
Editorial Recommendation More Editorial Recommendations
Study of the Caroline plate: Initial subduction, initial spreading and fluid-solid interaction
The western Pacific has the most active plate tectonic processes and land-ocean interactions. The Caroline Basin is a small plate formed between the Tethys and the Pacific, currently located at the throat of the Indonesian seaway, and takes a large area of the western Pacific warm pool. The Caroline plate is rather complex topographically and is characterized by ridges and relic spreading centers. The plate is bordered by young active subduction zones and active spreading centers, and strongly interacts with the surrounding Philippine Sea plate, the Pacific plate, the Ontong-Java large igneous province, and many deep trenches. Therefore, it is an ideal place for studying process and dynamics of initiation of subduction and seafloor spreading, as well as the interaction of the solid earth with seawater. In the past, the investigation of the Caroline Basin was done mostly in the 70—80 s of last century. So far, many controversies remain unsolved on the nature and genesis of some tectonic units, and the interactions among multiple geospheres were seldom explored. The implementation of the major research project on " Multi-sphere Interaction of the Western Pacific Earth System” supported by the National Natural Science Foundation of China greatly accelerate the pace of marine research in the Western Pacific region. In this project, we conduct comprehensive geophysical and geochemical analyses of the tectonic boundary process of the Caroline Basin and the extent of serpentinization of the uppermost lithospheric mantle in the basin. We also examine the coupling between the deep process in the lithosphere and the shallow process on the seabed, in particular the relationship between water and heat flux. Based upon the research, we propose in this paper an evolutional model for this unique oceanic micro-plate and its tectonic boundaries. Further research activities, including scientific ocean drilling, are recommended.
LI Chunfeng, LI Gang, LI Zilong, LIU Wenxiao, ZHANG Lulu, LU Zhezhe, CHEN Xuegang, YAO Zewei
doi: 10.16562/j.cnki.0256-1492.2019031501
Marine Geology & Quaternary Geology.2019: 87-97
PDF XML Download
Editorial Recommendation More Editorial Recommendations
The sources of dissolved iron in the global ocean and isotopic tracing
Iron is an essential trace element to oceanic primary productivity, which may influence the structure of marine biological community, ecological function, and carbon cycle. It is therefore of great importance to understand the sources and supply of dissolved Fe to the ocean and its responses to the global climate change. Early studies often emphasize dust input as the mechanism to maintain oceanic Fe cycling. In recent years, with the increase in Fe data, especially along with the launch of GEOTRACES program, the important role of dissolved Fe released from continental shelf sediments and hydrothermal activities has been highlighted. Nevertheless, there still remain considerable uncertainties regarding the contribution of Fe to the open ocean from different sources. Our review begun with characterizing the chemical speciation of dissolved Fe, especially of organic ligand in oceanic Fe cycling, and then presented flux estimation of different Fe sources as well as the debates regarding the oceanic Fe fertilization during the time of Quaternary. Iron isotopes provide a new tool for studying the evolution of Fe sources. We have discussed the Fe isotope signatures of different sources, and proposed that the combination of isotopes and speciation analysis of sedimentary reactive Fe might provide a new perspective in understanding the mechanism of Fe export and transport from continental shelf, hydrothermal activity, and dust in the past.
CHEN Tianyu, CAI Pinghe, LI Weiqiang, YANG Tao, LING Hongfei, JI Junfeng
doi: 10.16562/j.cnki.0256-1492.2019070501
Marine Geology & Quaternary Geology.2019: 46-57
PDF XML Download
Display Method: