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| 1 | Activity criterion of pre-existing fabrics in non-homogeneous deformation domain显示文摘The Anderson's model can be applied only to elastic homogeneous deformation and cannot explain complicated phenomena of natural faults, which to a large degree limits the model to practical application. By combing the Coulomb-Mohr Criterion with the sandbox modeling and considering non-homogeneous deformation, mechanisms of how basement pre-existing fabrics control fault formation and evolution are analyzed and a mechanical factor, activation-coefficient (faS) of pre-existing fabrics, is proposed. It is determined by the attitude and mechanical properties of pre-existing fabric, and the stress state (the magnitudes and directions of the three principal stresses). The coefficient has taken the heterogeneity of rocks into account and may serve as a criterion for evaluating the activity of a pre-existing fabric. The Mohr-Coulomb Criterion is expanded to non-homogeneous deformation domain in terms of activation-coefficient (faS) of pre-existing fabrics, the general law of the activity of a pre-existing fabric is predicted, the fault complexity real of rift basin is revealed in theory, and the controlling law of basement pre-existing faults to fault formation and evolution is determined, and checked with sandbox modeling. A new way is provided for in-depth study of faulting. | TONG HengMao CAI DongSheng WU YongPing LI XiaoGuang LI XuShen MENG LingJian | 2010 | Science China Earth Sciences2010，53，8： | 17 |
| 2 | Geology and hydrocarbon accumulations in the deepwater of the northwestern South China Sea——with focus on natural gas显示文摘The deepwater of the northwestern South China Sea is located in the central to southern parts of the Qiongdongnan Basin(QDN Basin),which is a key site for hydrocarbon exploration in recent years.In this study,the authors did a comprehensive analysis of gravity-magnetic data,extensive 3D seismic survey,cores and cuttings,paleontology and geochemical indexes,proposed the mechanism of natural gas origin,identified different oil and gas systems,and established the model of hydrocarbon accumulations in the deep-water region.Our basin tectonic simulation indicates that the evolution of QDN Basin was controlled by multiple-phased tectonic movements,such as Indochina-Eurasian Plate collision,Tibetan Uplift,Red River faulting and the expansion of the South China Sea which is characterized by Paleogene rifting,Neogene depression,and Eocene intensive faulting and lacustrine deposits.The drilling results show that this region is dominated by marineterrestrial transitional and neritic-bathyal facies from the early Oligocene.The Yacheng Formation of the early Oligocene is rich in organic matter and a main gas-source rock.According to the geological-geochemical data from the latest drilling wells,Lingshui,Baodao,Changchang Sags have good hydrocarbon-generating potentials,where two plays from the Paleogene and Neogene reservoirs were developed.Those reservoirs occur in central canyon structural-lithologic trap zone,Changchang marginal trap zone and southern fault terrace of Baodao Sag.Among them,the central canyon trap zone has a great potential for exploration because the various reservoirforming elements are well developed,i.e.,good coal-measure source rocks,sufficient reservoirs from the Neogene turbidity sandstone and submarine fan,faults connecting source rock and reservoirs,effective vertical migration,late stage aggregation and favorable structural–lithological composite trapping.These study results provide an important scientific basis for hydrocarbon exploration in this region,evidenced by the recent discovery of the significant commercial LS-A gas field in the central canyon of the Lingshui Sag. | WANG Zhenfeng SUN Zhipeng ZHANG Daojun ZHU Jitian LI Xushen HUANG Baojia GUO Minggang JIANG Rufeng | 2015 | Acta Oceanologica Sinica2015，34，10： | 9 |
| 3 | Geochemistry of Pore Water and Associated Diagenetic Reactions in the Diapiric Area of Yinggehai Basin, Northwestern South China Sea显示文摘这研究在 Yinggehai 盆的 diapiric 区域检验了毛孔水的 geochemical 特征,西北的华南海,并且照亮了盆液体的起源和进化。甚至没有大气的水渗入,有低咸度的毛孔水在 diapiric 区域发生在海洋的沉积。在内的低咸度的水的存在深, overpressured 分隔空间被假定由于 smectite-illite 转变。Howerver 在有正常压力的 diapiric 区域的浅部分(不到 2 000 m ) ,毛孔水在 overpressured 间隔比那有一个宽得多的变化和低得多的咸度。它的全部的溶解固体(TDS ) 内容是 5 336 ~ 35 939 mg/L。而且,当 kaolinite 和 illite 在更浅的间隔满足增加,绿土和绿泥石内容严厉地减少。在 diapiric 结构的毛孔水的 geochemical 变化显示逐出低咸度,沿着垂直差错的 overpressured 液体。从深 overpressured 沉积的热液体的强壮的注射在浅水库导致快速的泥土矿物质转变。因而,从更深的 overpressured 沉积物由于液体逐出混合的液体象一些 diagenetic 反应一样在咸度和离子的作文导致变化。这包括更深热的液体的更高的 temperatur 引起的泥土矿物质的转变,例如,到 illite 的绿土和到 kaolinite 的绿泥石的 transfromation。因此,在咸度的变化和在各种各样的迫使的系统的离子的作文提供线索给流动小径和联系 diagenetic 反应。 | Tao Jiang Xinong Xie Hui Chen Zhenfeng Wang Xushen Li | 2015 | Journal of Earth Science2015，26，3： | 6 |
| 4 | Difference in full-filled time and its controlling factors in the Central Canyon of the Qiongdongnan Basin显示文摘Based on the interpretation of high resolution 2D/3D seismic data,sedimentary filling characteristics and fullfilled time of the Central Canyon in different segments in the Qiongdongnan Basin of northwestern South China Sea have been studied.The research results indicate that the initial formation age of the Central Canyon is traced back to 11.6 Ma(T40),at which the canyon began to develop due to the scouring of turbidity currents from west to east.During the period of 11.6–8.2 Ma(T40–T31),strong downcutting by gravity flow occurred,which led to the formation of the canyon.The canyon fillings began to form since 8.2 Ma(T31) and were dominated by turbidite deposits,which constituted of lateral migration and vertical superposition of turbidity channels during the time of8.2–5.5 Ma.The interbeds of turbidity currents deposits and mass transport deposits(MTDs) were developed in the period of 5.5–3.8 Ma(T30–T28).After then,the canyon fillings were primarily made up of large scale MTDs,interrupted by small scale turbidity channels and thin pelagic mudstones.The Central Canyon can be divided into three types according to the main controlling factors,geomorphology-controlled,fault-controlled and intrusionmodified canyons.Among them,the geomorphology-controlled canyon is developed at the Ledong,Lingshui,Songnan and western Baodao Depressions,situated in a confined basin center between the northern slope and the South Uplift Belt along the Central Depression Belt.The fault-controlled canyon is developed mainly along the deep-seated faults in the Changchang Depression and eastern Baodao Depression.Intrusion-modified canyon is only occurred in the Songnan Low Uplift,which is still mainly controlled by geomorphology,the intrusion just modified seabed morphology.The full-filled time of the Central Canyon differs from west to east,displaying a tendency of being successively late eastward.The geomorphology-controlled canyon was completely filled before3.8 Ma(T28),but that in intrusion-modified canyon was delayed to 2.4 Ma(T27) because of the uplifted southern canyon wall.To the Changchang Depression,the complete filling time was successively late eastward,and the canyon in eastern Changchang Depression is still not fully filled up to today.Difference in full-filled time in the Central Canyon is mainly governed by multiple sediment supplies and regional tectonic activities.Due to sufficient supply of turbidity currents and MTDs from west and north respectively,western segment of the Central Canyon is entirely filled up earlier.Owing to slower sediment supply rate,together with differential subsidence by deep-seated faults,the full-filled time of the canyon is put off eastwards gradually. | SHANG Zhilei XIE Xinong LI Xushen ZHANG Daojun HE Yunlong YANG Xing CUI Mingzhe | 2015 | Acta Oceanologica Sinica2015，34，10： | 5 |
| 5 | Characteristics and distribution patterns of reef complexes on the carbonate platform margin in deep water areas:the western South China Sea显示文摘As a potential oil and gas reservoir,reef complexes have been a research focus from petroleum geologists for a long time.There are favorable conditions for the development of reef complexes in the South China Sea; however,their internal structures,evolution and distribution are still poorly understood.Based on 2D and 3D seismic data,the internal structures and evolution patterns of the reef complexes on the carbonate platform margin in the deep water areas over the western South China Sea were studied in detail.The result shows that two types of reef complexes,i.e.,fault controlling platform margin reef complexes and ramp reef complexes have been developed in the study area.The reef complexes have independent or continuous mound or lenticular seismic reflections,with three internal structures(i.e.,aggrading,prograding and retrograding structures).There are different growth rates during the evolution of the reef complexes,resulting in the formation of catch-up reefs,keep-up reefs and quick step reefs.The study also reveals that different platform margin reef complexes have different internal structures and distributions,because of the different platform types.These results may be applied to the exploration and prediction of carbonate platform margin reef complexes in other areas that are similar to the study area. | CHEN Ping LI Xushen WANG Yahui LU Yongchao ZHONG Zehong CHEN Lei ZUO Qianmei MA Yiquan WANG Chao DU Xuebin | 2015 | Acta Oceanologica Sinica2015，34，10： | 3 |
| 6 | Isolations and Identifications of Two Psychrotrophs and Preliminary Research on Their Applications显示文摘[Objective]The research aimed to initially study degradation effect of the COD Cr in sewage by two psychrotrophs. [Method] Two psychrotrophs were isolated from the activated sludge of wastewater treatment plant in Tianjin Konggang Economic Area. COD Cr degradation ability of the screened psychrotroph was analyzed in simulated domestic wastewater at 6 ℃. [Result]K36 was identified as Comamonas testosterone,and K38 was identified as Serratia fonticola. COD Cr degradation abilities of the two strains were different in test. COD Cr removal rates of the K36 and K38 respectively reached up to 23% and 53%. The measured result of growth rate suggested that two psychrotrophs both had high activities at low temperature. [Conclusion]K36 and K38 had potentials in wastewater treatment application. | Huifeng Li Jinhui Huang Xushen Zhou Chao Lin Yang Luo | 2013 | Meteorological and Environmental Research2013，4，2： | 0 |
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