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Gravity anomaly during the Mohe total solar eclipse

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Gravity anomaly during the Mohe total solar eclipse

RESISTIVITY PRECURSORS AND SPREADING OF FAULT PRIOR TO ITS INSTABILITY

中国科学院地质与地球物理研究所2001.术年会

作者： wang {1.~1.YANG Xinshe~(1.2) & TANG Keyun~1.1.institute of geophysics,Chinese Academy of Sciences,beijing 1.01.1.china 2.Department of Applied Mathematics,University of Leeds,Leeds LS2 9JT,UK

By using a high-precision LaCoste-Romberg (D-1.2#) gravimeter,continuous and precise measurements were carried out during the March 9,1.97 total solar eclipse in the Mohe region in Northeast *** gravity variations were digitally recorded during the total solar eclipse so as to investigate the possible anomaly of the sun and the moon’s gravitational fields on the *** the careful processing and analysis of the observed data,no significant anomaly during the very solar eclipse has been ***, there are two ’gravity anomaly valleys’ with near symmetrical decrease of about 6—7μGal at the first contact and the last contact This is the anomaly phenomenon observed and reported for the first time in the *** note presents some analyses and discussions.

关键词： Mohe total solar eclipse gravity anomaly

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Science in china,Ser.B 1985年第4期28卷 420-436页

作者：王新华祁贵仲赵玉林 institute of {1. State Seismological Bureau beijing

Based on fracture mechanics it has been found that earthquake precursors related to volumetric strain e are characterized by quadrants, blind zone and uneven propagation, and the approximate formulae for spreading range of precursor have been obtained. These results are coincident with the information of resistivity ρx observed before the Tangshan earthquake, and then mechanical explanations have been made for some precursors of ρx, such as precursors appearing concentratedly within the period of 1.2 years before the instability of the fault （i.e. subcritical period in which the fault spreads acceleratingly）. Before instability of the spreading of fault, the range of e=1.-6 reaches about 1.0 km, its propagating velocity is about 1.0 km/yr, the amplification coefficient of ρx is about 1.4, etc. The half length of fault before instability is about 35km. It seems that in propagating process the spreading of the fault is delayed by barrier.

关键词： spreading blind propagating approximate volumetric instability formulae contour resistivity appearing

Chemical, carbon and sulfur isotopic compositions constrain the origin of Upper Carboniferous-Lower Triassic gases in eastern Sichuan Basin, SW china

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Science china Earth Sciences 2024年第10期67卷 3169-3185页

作者： Chunfang CAI Ilya KUTUZOV Wenhua MEI Daowei wang Bing LUO Shipeng HUANG Bing HE Alon AMRANI china University of Petroleum National Key Lab Petroleum Resource&EngineeringBeijing 102249China State Key Laboratory of Lithospheric and Environmental Coevolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China institute of Earth Sciences The Hebrew UniversityJerusalem 91904Israel College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China yulin University Yulin 719000China Research institute of Exploration and Development Southwest Oil&Gas Field CompanyPetroChinaChengdu 610051China Petrochina Research Institute of Petroleum Exploration and DevelopmentBeijing 100083China

Methane dominated gas is one of the cleanest energy resources;however, there is no direct method to determine its source rock. Natural gases produced from the eastern Sichuan Basin together with seismic data were studied for their sources and secondary alteration by thermochemical sulfate reduction(TSR). Our results demonstrate that Upper Permian to Lower Triassic(P_(3)ch-T_(1.f) gases in the surrounding of the Kaijiang-Liangping area show volatile organic sulfur compounds(VOSCs) δ^(34)S values close to those of the associated H_(2)S, and may have been altered by methane-dominated TSR, resulting in positive shift in methane δ^(1.)C_(1.values with increasing TSR extents. Other(or group 2) gases produced from the P_(3)ch-T_(1.f reservoirs from the southern area and the Upper Carboniferous to Middle Permian(C_(2)h-P_(2)q) from the eastern Sichuan Basin are not significantly changed by TSR, show similar δ^(34)S values between the kerogens and some VOSCs, and may have been derived from the Lower Silurian and Middle Permian source rocks. This study demonstrates a case for the first time showing the δ^(34)S values of VOSCs can be used as a tool for direct correlation between non-TSR altered gas and source rocks. Methane-dominated gas pools can be found using gas and source rock geochemistry combined with seismic data.

关键词： Sulfur isotopes Volatile organic sulfur compounds Thermochemical sulfate reduction Sichuan Basin Gas-source rock correlation

Impending HRT wave precursors to the Wenchuan M_s8.0 earthquake and methods of earthquake impending prediction by using HRT wave

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Science china Earth Sciences 2009年第10期52卷 1572-1584页

作者： QIAN FuYe ZHAO BiRu QIAN Wei ZHAO Jian HE ShiGen ZHANG HongKui LI ShiYu LI ShaoKun YAN GuLiang wang ChengMin SUN ZhenKai ZHANG DongNing LU Jun ZHANG Ping YANG GuoJun SUN JiaLin GUO ChunSheng TANG YuXiong XU JianMing XIA KunTao JU Hang YIN BangHong LI Ming YANG DongSheng QI WeiLuo HE TaiMing GUAN HuaPing ZHAO {1. institute of {1. China Earthquake AdministrationBeijing 100081China Tianjin Hi-tech Development Co.Ltd Tianjin 300201China Department of Physics University of TorontoL6C1V9Canada College of Disaster Prevention Techniques Yanjiao 065201China Earthquake Administration of beijing Municipality Beijing 100080China Earthquake Administration of Sichuan Province Chengdu 610041China Committee of National Development and Reformation Beijing 100824China institute of Earthquake Science China Earthquake AdministrationBeijing 100036China china Earthquake Network Center Beijing 100036China Earthquake Administration of Yunnan Province Kunming 650041China Earthquake Administration of Tianjin Municipality Tianjin 300201China Earthquake Administration of Inner Mongolia Autonomous Region Huhhot 010010China The Gucheng District Bureau Lijiang674100China

We deployed four geo-electric monitoring stations in Sichuan and Yunnan provinces from 2004, using the new generation of equipment (PS-1.0) and technologies to capture the HRT wave earthquake precursor. Before the Wenchuan Ms8.0 earthquake, we recorded the HRT wave precursor at the only operating station in Hongge (HG, Δ=465 km) and found that significant impending signal had been recorded at the station in the early morning ( 0―5 am) of 1.th of May, 2008. The precursor for this earthquake is consistent with precursors recorded for other strong earthquakes. The measured physical properties (geo-resistivity and telluric-current) show tidal wave period oscillations from several days to several months before the earthquakes and the amplitude of such HT oscillation increases significantly towards the occurrence of an earthquake. These HT and RT waves from the epicenter have a causal relationship with the earthquakes that happened several days later. The arrival time of two RT waves is proportional to the distance from the station to the epicenter. The estimated natural decay of the amplitude is correlated with the natural period (T0) of the earthquake fault, which is proportional to the fault length. From this relationship, we can predict the earthquake magnitude. For magnitude 6―9 earthquakes, the natural period is about 1.6 hours. Such oscillation comes from the epicenter area and they can propagate several thousand kilometers in the Earth's crust. Before a strong earthquake in the shallow crust, the conductive pore fluid will experience major changes before the fault rapture. Such fluid change will emit an oscillation in the pore fluid pressure. This is the mechanism for the HRT wave generation. Since the china Earthquake Administration funded the HRT wave short-term earth-quake prediction project in 2003, the first record of HRT precursor wave has been recorded from the 2004-1.-26 Sumatra Mw9.0 earthquake with the largest epicentre distance Δ=2900 km. Thereafter, we

关键词： Wenchuan Ms8.0 earthquake HRT wave (mechanism) model PS-1.0 geo-resistivity meter HRT wave precursor precursor consistency feasibility of short-term and impending earthquake prediction

中上扬子地区震旦纪灯影组沉积期碳酸盐岩台地古地理格局及有利储集相带分布规律

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沉积学报 2024年第3期42卷 928-943页

作者：丁一刘树根文龙文华国陈代钊宋金民王瀚王林康陈明思陈荣庆李智武成都理工大学油气藏地质及开发工程国家重点实验室成都610059 成都理工大学沉积地质研究院成都610059 西华大学成都610039 中国石油西南油气田公司勘探开发研究院成都610041 中国科学院地质与地球物理研究所新生代地质与环境重点实验室北京100029

【目的】中上扬子地区灯影组沉积期碳酸盐岩台地古地理格局及有利储集相带发育分布规律尚存争议,阻碍了灯影组油气勘探领域由绵阳—长宁拉张槽两侧向其他广大地区拓展。【方法】通过中上扬子地区灯影组30余条剖面(钻井)开展岩石类型划... 详细信息

【目的】中上扬子地区灯影组沉积期碳酸盐岩台地古地理格局及有利储集相带发育分布规律尚存争议,阻碍了灯影组油气勘探领域由绵阳—长宁拉张槽两侧向其他广大地区拓展。【方法】通过中上扬子地区灯影组30余条剖面(钻井)开展岩石类型划分及沉积相分析,【结果】进一步明确丘滩相以块状砂屑/鲕粒白云岩及柱状、穹窿状叠层石白云岩为特征,呈环带状分布在中上扬子台地(或内缓坡)边缘,向外过渡为中—外缓坡风暴岩或斜坡—盆地相区的滑塌角砾白云岩、泥质白云岩、硅质岩等。由于丘滩的阻挡作用,其内侧以低能的潮坪及潟湖沉积环境为主:其中潮坪相主要发育微生物纹层白云岩、穹窿—缓波状叠层石白云岩、凝块石白云岩夹砂屑白云岩、泥晶白云岩,纵向上常常形成米级—厘米级旋回;潟湖相主要由泥晶白云岩、含球粒/砂屑泥晶白云岩组成。相带时空分布表明灯影组在中上扬子地区总体呈现出进积的沉积趋势,内部包含2.5个层序,即三次进积(变浅)和两次退积(变深)旋回。【结论】由于灯影组在台地边缘—斜坡区域普遍遭到剥蚀,以及灯影组沉积期上扬子台地范围远超目前的板块边界,灯影组上部灯四段很少发现高能丘滩相带。在此背景下,局部地区(如松林—岩孔地区、中扬子台地周缘)灯影组中下部灯一段—灯二段(或蛤蟆井段、石板滩段)发育的丘滩相,是重要的有利储集相带。此外,处于海退体系域的灯二段中下部和灯四段上部(或相当层位)在中上扬子台地(或内缓坡)内部广泛发育微生物白云岩,也为储层发育有利相带。在中上扬子台地微生物白云岩广泛分布的背景下,进一步分析优质储层发育机理与分布规律才是找到油气接替区的关键。

关键词：中上扬子地区灯影组碳酸盐岩台地古地理格局储集相带