ABSTRACT： Reef-bank of Sichuan （四川） basin have been explored along the platform margin belt on both sides of the Kaijiang （开江）-Liangping （梁平） trough for a long time. Correspondingly, a series of major bre...ABSTRACT： Reef-bank of Sichuan （四川） basin have been explored along the platform margin belt on both sides of the Kaijiang （开江）-Liangping （梁平） trough for a long time. Correspondingly, a series of major breakthroughs have been obtained and a number of large oil and gas fields have been found. After the breakthroughs of Kaijiang-Liangping trough, how reef-bank exploration will proceed？ Is there another ＂Kaijiang-Liangping trough＂ in Sichuan basin？ Previous research shows that Sichuan basin underwent intracratonic rift and basement fault activities in Late Permian, developing a paleogeography framework of ＂three uplifts and three depressions＂ under the background of the regional large ramp, including Exi （鄂西）-Chengkou （城口） trough, Kaijiang-Liangping trough and Yanting （盐亭）-Tongnan （潼南） trough. Based on sedimentology and tectonics dynamics analysis, data of drillings, outcrops and seismic, Yanting-Tongnan trough has been discovered in central Sichuan basin in our study which distributes from Mianzhu （绵竹）, Jiangyou （江油） in western Sichuan basin through Nan-chong （南充） to Guang＇an （广安）, as long as about 210 km, extending in NW-SE nearly paralleling to Kaijiang-Liangping trough, opening to the sea north-westward, and gradually pinchout to the east platform. Similar to Kaijiang-Liangping trough, another platform margin reef belt distributes along a U-shape belt around Yanting-Tongnan trough, which is expected to become another natural gas accumulation zone after the platform margin around Kaijiang-Liangping trough. The discovery of Yanting-Tongnan trough expands favorable reef exploration area from original 2x 10^4 km2 on both sides of Kaijiang-Liangping trough to more than 6x10^4 km2 in Yanting-lbngnan trough platform margin belt and Kaijiang-Liangping platform margin belt, greatly enlarging the reef exploration field. But com-pared to Kaijiang-Liangping trough, YantingTongnan trough is relatively shallower and smaller, and the scale and quality of reef-bank reservoirs in its margin belt is a little poor relatively. Therefore, much research should be done timely such as comparative study of two troughs, detailed research of formation and evolution of the trough, regularity of reef migration, meticulous depiction of reef-bank reservoir size andDiscovery of Yanting-Tongnan Trough of Late Permian in Sichuan Basin and Its Significancedistribution in order to obtain major breakthroughs around the Yanting-Tongnan trough.展开更多
Usually, only crystalline basement is strong enough to store the massive strain energy that can be released in a damaging earthquake. By contrast, sedimentary cover is weak, because of its relatively high porosity and...Usually, only crystalline basement is strong enough to store the massive strain energy that can be released in a damaging earthquake. By contrast, sedimentary cover is weak, because of its relatively high porosity and fluids. Therefore, it generally cannot accumulate enough energy for strong earthquakes. On January 31, 2010, a M5.0 earthquake occurred near the border of Suining and Tongnan in China. It excited strong short-period Rayleigh waves Rg, indicative of its shallow focal depth. The focal depth is constrained to less than 4 km, most probably in the range of 1-3 km, by modeling amplitude dependence on the frequency and waveforms of teleseismic depth phases (pP, sP). Because the local Mesozoic sedimentary cover is about 6 km thick, this earthquake should have occurred in the sedimentary cover. Though some shallow earthquakes with magnitudes up to M4 occur in Paleozoic sediments, this earthquake is the first M5 event studied in Mesozoic sedimentary cover. This event provides a rare opportunity to study seismogenic processes of damaging earthquakes in sedimentary basins.展开更多
农村居民点复垦是坚持节约用地,推进新农村建设的客观要求。科学划定规划期农村居民点用地退出图斑,是测算农村居民点复垦潜力的关键所在。XF-GF空间合成识别技术体系是指以地理信息系统(Geograph-ical Information System,GIS)为技术平...农村居民点复垦是坚持节约用地,推进新农村建设的客观要求。科学划定规划期农村居民点用地退出图斑,是测算农村居民点复垦潜力的关键所在。XF-GF空间合成识别技术体系是指以地理信息系统(Geograph-ical Information System,GIS)为技术平台,将农村居民点用地现状分析与农村居民点用地规划分析进行空间合成,科学划定规划期农村居民点用地退出图斑的技术体系。以ArcGIS9.3为研究平台,利用GIS叠加分析功能,构建XF-GF空间合成识别技术体系,对潼南县双江镇双林村农村居民点复垦潜力进行定量与定位分析。研究结果表明:到规划目标期,双林村共退出农村居民点图斑99个,复垦潜力273 997.56m2。XF-GF空间合成识别技术在农村居民点复垦潜力定量定位分析中有借鉴意义。展开更多
基金supported by the Prominent National Projects of Science and Technology of China (No. ZDZX201105004-01)
文摘ABSTRACT： Reef-bank of Sichuan （四川） basin have been explored along the platform margin belt on both sides of the Kaijiang （开江）-Liangping （梁平） trough for a long time. Correspondingly, a series of major breakthroughs have been obtained and a number of large oil and gas fields have been found. After the breakthroughs of Kaijiang-Liangping trough, how reef-bank exploration will proceed？ Is there another ＂Kaijiang-Liangping trough＂ in Sichuan basin？ Previous research shows that Sichuan basin underwent intracratonic rift and basement fault activities in Late Permian, developing a paleogeography framework of ＂three uplifts and three depressions＂ under the background of the regional large ramp, including Exi （鄂西）-Chengkou （城口） trough, Kaijiang-Liangping trough and Yanting （盐亭）-Tongnan （潼南） trough. Based on sedimentology and tectonics dynamics analysis, data of drillings, outcrops and seismic, Yanting-Tongnan trough has been discovered in central Sichuan basin in our study which distributes from Mianzhu （绵竹）, Jiangyou （江油） in western Sichuan basin through Nan-chong （南充） to Guang＇an （广安）, as long as about 210 km, extending in NW-SE nearly paralleling to Kaijiang-Liangping trough, opening to the sea north-westward, and gradually pinchout to the east platform. Similar to Kaijiang-Liangping trough, another platform margin reef belt distributes along a U-shape belt around Yanting-Tongnan trough, which is expected to become another natural gas accumulation zone after the platform margin around Kaijiang-Liangping trough. The discovery of Yanting-Tongnan trough expands favorable reef exploration area from original 2x 10^4 km2 on both sides of Kaijiang-Liangping trough to more than 6x10^4 km2 in Yanting-lbngnan trough platform margin belt and Kaijiang-Liangping platform margin belt, greatly enlarging the reef exploration field. But com-pared to Kaijiang-Liangping trough, YantingTongnan trough is relatively shallower and smaller, and the scale and quality of reef-bank reservoirs in its margin belt is a little poor relatively. Therefore, much research should be done timely such as comparative study of two troughs, detailed research of formation and evolution of the trough, regularity of reef migration, meticulous depiction of reef-bank reservoir size andDiscovery of Yanting-Tongnan Trough of Late Permian in Sichuan Basin and Its Significancedistribution in order to obtain major breakthroughs around the Yanting-Tongnan trough.
基金supported by the special fund of the Institute of Earthquake Sciences (02092410)the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-116)
文摘Usually, only crystalline basement is strong enough to store the massive strain energy that can be released in a damaging earthquake. By contrast, sedimentary cover is weak, because of its relatively high porosity and fluids. Therefore, it generally cannot accumulate enough energy for strong earthquakes. On January 31, 2010, a M5.0 earthquake occurred near the border of Suining and Tongnan in China. It excited strong short-period Rayleigh waves Rg, indicative of its shallow focal depth. The focal depth is constrained to less than 4 km, most probably in the range of 1-3 km, by modeling amplitude dependence on the frequency and waveforms of teleseismic depth phases (pP, sP). Because the local Mesozoic sedimentary cover is about 6 km thick, this earthquake should have occurred in the sedimentary cover. Though some shallow earthquakes with magnitudes up to M4 occur in Paleozoic sediments, this earthquake is the first M5 event studied in Mesozoic sedimentary cover. This event provides a rare opportunity to study seismogenic processes of damaging earthquakes in sedimentary basins.
文摘农村居民点复垦是坚持节约用地,推进新农村建设的客观要求。科学划定规划期农村居民点用地退出图斑,是测算农村居民点复垦潜力的关键所在。XF-GF空间合成识别技术体系是指以地理信息系统(Geograph-ical Information System,GIS)为技术平台,将农村居民点用地现状分析与农村居民点用地规划分析进行空间合成,科学划定规划期农村居民点用地退出图斑的技术体系。以ArcGIS9.3为研究平台,利用GIS叠加分析功能,构建XF-GF空间合成识别技术体系,对潼南县双江镇双林村农村居民点复垦潜力进行定量与定位分析。研究结果表明:到规划目标期,双林村共退出农村居民点图斑99个,复垦潜力273 997.56m2。XF-GF空间合成识别技术在农村居民点复垦潜力定量定位分析中有借鉴意义。
