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Extensional structures of the Nan'an Basin in the rifting tip of the South China Sea: Implication for tectonic evolution of the southwestern continental margin

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Petroleum Science 2023年第1期20卷 128-140页

作者： Shi-Guo Wu Li Zhang Zhen-Yu Lei Xing Qian Shuai-Bing Luo Xiang-Yang Lu Thomas Lüdmann Lei Tian Laboratory of Geophysics and Georeouce Institute of Deep-sea Science and EngineeringChina Academy of ScienceSanyaHainan 572000China MLR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyGuangzhouGuangdong 510075China South Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiGuangdong 519000China University of China Academy of Sciences Beijing 100049China Institute for Geology CENUniversity of HamburgHamburg20146Germany Research Institute of Petroleum Exploration and Development Northwest Branch LanzhouGansu 730000China

Nan'an Basin is a giant hydrocarbon basin,but its tectonic division scheme and associated fault systems has not been well understood.Based on newly acquired seismic data from the southwestern margin of the South China Sea,this study analyzed the structural units,tectonic feature and geodynamics of the sedimentary basin.The new data suggests that the Nan0 an Basin is a rift basin oriented in the NE-SW direction,rather than a pull-apart basin induced by strike-slip faults along the western margin.The basin is a continuation of the rifts in the southwest South China Sea since the late Cretaceous.It continued rifting until the middle Miocene,even though oceanic crust occurred in the Southwest Subbasin.However,it had no transfer surface at the end of spreading,where it was characterized by a late middle Miocene unconformity(reflector T3).The Nan'an Basin can be divided into eight structural units by a series of NE-striking faults.This study provides evidences to confirm the relative importance and interplay between regional strike-slips and orthogonal displacement during basin development and deformation.The NE-SW-striking dominant rift basin indicates that the geodynamic drivers of tectonic evolution in the western margin of the South China Sea did not have a large strike-slip mechanism.Therefore,we conclude that a large strike-slip fault system did not exist in the western margin of the South China Sea.

关键词： Sedimentary basin seismic sequence Rifting Tectonic evolution South China Sea

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seismic Facies in a Deepwater Area of a Marine Faulted Basin:Deepwater Area of the Paleogene Lingshui Formation in the Qiongdongnan Basin

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Acta Geologica Sinica(English Edition) 2012年第2期86卷 473-483页

作者： CHEN Huanqning ZHU Xiaomin ZHANG Gongcheng ZHANG Xilin ZHANG Qin Research Institute of Petroleum Exploration andDevelopment PetroChinaBeijing 100083China College of Geosciences China University of PetroleumBeijing 102249China Research Institute China National Offshore Oil Corp.Beijing 100027China

In recent years, deep water areas have become popular exploration fields because of their abundant hydrocarbon resource potential. There are only relatively poor planar seismic profiles and no wells for deepwater areas of the Lingshui Formation in the Qiongdongnan Basin. A lot of faults developed and strata are fragmented due to high temperatures and high pressure, and this has resulted in dim sequence boundaries. Based on seismic data of the deepwater area and well data of bordering shallow water areas, Lingshui Formation was divided into four third class sequences; namely SI, SII, SIII and SIV, and the three-dimensional isochronous stratigraphic framework of the Lingshui Formation in the studied area was shaped. Based mainly on seismic attributes such as amplitude, continuity, internal structure and external shape, six typical seismic facies were identified, including mat-shaped, filling, wedge-shaped, foreset, moundy-shaped and lenticular-shaped, and a seismic facies distribution map was subsequently drawn. With studies on wells of bordering shallow water areas, regional sedimentary characteristics, and isopach map as references, sedimentary planar distribution features were analyzed. The deepwater area of the Lingshui Formation has mainly developed littoral and shallow sea. Sandstone bodies of fan delta, braided river delta, slope fan, basin floor fan, and turbidite fan are at an interdigitate junction to marine hydrocarbon source rocks and thus are favorable prospecting targets.

关键词： seismic sequence seismic facies sedimentary facies deepwater area faulted basin Paleogene

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THREE KINDS OF TIME DISTRIBUTION FUNCTIONS OF REMARKABLE EARTHQUAKES IN seismic sequenceS

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地震研究 1998年第1期 103-108页

作者： Diao Shouzhong Wang Hongwei Chao Hongtai Hua Aijun (Seismological Bureau of Shandong Province, Jinan 250014, P.R.China)

ＴＨＲＥＥＫＩＮＤＳＯＦＴＩＭＥＤＩＳＴＲＩＢＵＴＩＯＮＦＵＮＣＴＩＯＮＳＯＦＲＥＭＡＲＫＡＢＬＥＥＡＲＴＨＱＵＡＫＥＳＩＮＳＥＩＳＭＩＣＳＥＱＵＥＮＣＥＳＤｉａｏＳｈｏｕｚｈｏｎｇＷａｎｇＨｏｎｇｗｅｉＣｈａｏＨｏ... 详细信息

ＴＨＲＥＥＫＩＮＤＳＯＦＴＩＭＥＤＩＳＴＲＩＢＵＴＩＯＮＦＵＮＣＴＩＯＮＳＯＦＲＥＭＡＲＫＡＢＬＥＥＡＲＴＨＱＵＡＫＥＳＩＮＳＥＩＳＭＩＣＳＥＱＵＥＮＣＥＳＤｉａｏＳｈｏｕｚｈｏｎｇＷａｎｇＨｏｎｇｗｅｉＣｈａｏＨｏｎｇｔａｉＨｕａＡｉｊｕｎ（Ｓｅｉ...

关键词： seismic sequence time distribution power funcfion disfribufion exponentl distribufion linear distribufion China continent.

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Multi-scale expression of spatial activity anomalies of earthquakes and its indicative significance on the space and time attributes of strong earthquakes

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Acta Seismologica Sinica(English Edition) 2003年第3期16卷 292-303页

作者：裴韬杨明张讲社周成虎骆剑承李全林 State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Faculty of Science Xi'an Jiaotong UniversityXi'an 710049China Institute of Geophysics CSBBeijing 100081China

The noise modei based on 6 trous wavelet algorithm produces a multi-scale expression of image through the combination of wavelet transform and a testing modei of statistical significance. This kind of expression not only gives the formation and location of image structure on different scales, but also eliminates the influence of noise. Since the algorithm does not need any priori hypotheses, it is suitable for the data with complex structure. The research line is employed in this paper to analyze the spatial activity of earthquake. The method of how to recognize and describe the multi-scale space activity of earthquake is emphatically discussed in this paper. Taking typical sequences in Southwest China as research cases, we systematically study the structure characters of spatial activity of earthquake on different scales. Results show that multi-scale space structure to some extent possesses indicative effect on strong epicenters. And the foreshock anomalies of Songpan seismic sequence also reveal interesting pattern during the spatial-temporal evolvement.

关键词： noise model á trous vvavelet algorithm foreshock anomaly seismic sequence

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Methods for Determining the Epicenter of Strong Earthquake

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Open Journal of Earthquake Research 2021年第2期10卷 42-67页

作者： Giulio Riga Paolo Balocchi Geologist Independent Researcher Italy

The analysis of seismic sequences is the primary objective for the study of the evolution of seismicity in a particular area, in order to determine a greater awareness of its seismogenic potential. The eventual determination of the epicenters of future earthquakes associated with the expected magnitude can be the tool to better seismic prevention. In this paper, we present some procedures for epicenter prediction of a strong earthquake, developed after a careful analysis of the fluctuations of latitude and longitude values in time and space and distance, between seismic events occurred in a specific area. By analyzing several seismic sequences, whose data have been taken from the numerous catalogs on seismicity, we noticed that the epicenters of the earthquakes that precede the strongest ones, tend to converge towards the epicenter where the strong earthquake will happen, following a pattern and a repetitive directional trend. Analysis of the pattern and trend, which represent the fluctuation of events and distances between pairs of earthquakes, has allowed us to localize the epicentral area of a future earthquake, which more reliably complements the other forecasting methods we have developed in the past. Retrospective tests performed on past seismic sequences have shown that the predictive procedures developed are able to identify in a simple way and in the short term, the area where a strong earthquake is most likely to occur.

关键词： Dynamicepicenter Mainshock seismic sequence

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Focal Depth Determination of the 2014 Yutian MS7.3 Earthquake sequence,Xinjiang

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Earthquake Research Advances 2014年第4期28卷 448-461页

作者： Song Xiuqing Miao Fajun Liu Shuangqing Chen Xiangjun Wang Jun Zhu Yuanqing Earthquake Administration of Shanghai Municipality Earthquake Administration of Jiangsu Province Earthquake Administration of Tianjin Municipality Earthquake Administration of Xinjiang Uygur Autonomous Region

An MS7.3 earthquake occurred on February 12,2014 in Yutian County,Xinjiang Uygur Autonomous Region,which was followed by a series of aftershocks. This paper calculates the depth of the MS7.3 earthquake sequence by using the deterministic approach with the seismic phase data from the catalog database of the China Earthquake Networks Center,combined with original seismic wave records from the Digital seismic Network Center of the Earthquake Administration of Xinjiang Uygur Autonomous Region.

关键词： Focal depth Crustal velocity model seismic sequence PTD method

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