延吉盆地多期不整合面的形成及其油气地质意义

延吉盆地是一个后期改造较为强烈的断陷盆地。应用地震、地质、测井资料识别出延吉盆地中存在6个较大的不整合面,它们以角度不整合和超覆不整合2种类型为主。分析认为,燕山Ⅰ、Ⅱ幕运动形成了盆地雏形,燕山Ⅳ幕运动则使盆地回返,此期出现大量高岭石（40%）,表明其与大气水淋滤等有关。短暂沉降后（龙井组）,燕山运动晚期（Ⅴ幕）发生的又一次大规模以南北挤压为主的构造运动,导致南北两翼抬起幅度巨大,剥蚀厚度超过700 m,盆地中部剥蚀厚度大约为300 m。不整合面是划分三大构造层（前断陷期、断陷期、坳陷期）的依据。其早白垩世铜佛寺组和大砬子组间的整合关系利于油气的生成。不整合面既可改善储集体的渗透性,又是形成油气二次运移的良好通道。初步预测与不整合有关的油气藏（侵蚀残丘、地层超覆不整合、断层坡折）可作为下一步勘探的目标。     

综合物探方法在西安东郊地热勘测中的应用

西安东郊灞河谷地处于骊山断隆西南斜坡上.利用MT、地震测深及重力测量结果综合解释了测区新生界的厚度,推断了隐伏断裂的性状及切割深度,选择了拟建地热井的新生界热储,并经钻探验证,取得了良好的地质效果.     

叠前时间偏移技术在八宝矿区的应用

八宝矿区总体构造形态为不对称的向斜构造,北翼岩层倾角达60°～80°,南翼倒转,矿区断层较多,三维地震叠后时间偏移成像困难,为此进行了三维叠前时间偏移外理。在本次地震资料处理中,选取偏移孔径为5000,依据CRP道集拉平程度确定叠前时间偏移速度场,以区内CMP道集内的炮检距分布情况确定最大、最小炮检距和炮检距增量,并将反假频距离确定为CMP间距的1～1.5倍。通过对比叠前、叠后时间偏移剖面,可以发现叠前时间偏移剖面能够较好地反眏深层构造及大倾角地层情况,其信噪比较高,地震剖面同相轴连续性好,断点清晰,处理效果显著。     

华机构造单元划分及其特征

华南（研究区）由杨子地块东南部和华夏地块组成。前者划分为三个次级构造单元;江南构造城,怀玉山—浙西北构造域,彭庐构造域;后者划分为二个次级构造单元;闽北—浙东南构造域,桂粤湘赣闽构造域。华夏地块相对于扬子地块是比较活动的构造单元。     

强对流风暴中同质冻结增温的直接探空观测

通过两个强对流风暴个例,利用探空资料辅以卫星反演方法,揭示了强对流风暴中同质冻结增温这一事实。探空观测到在强风暴中同质冻结潜热释放造成该层内的空气增温达5℃以上,风暴中强上升气流使云滴没有足够的时间长大,云水向雨水转化和云的晶化会被推到更高的高度,在到达同质冻结高度之前,异质核化过程没有太多的时间消耗大量云水,多数云滴被带到同质冻结高度以上时迅速冻结,造成潜热的集中释放,使周围的空气增温。NOAA卫星观测到的云顶的大量由同质冻结形成的小冰粒子以及过顶现象,进一步证实了同质冻结潜热增温。当探空仪靠近风暴、对流层顶又距同质冻结高度层较近时,同质冻结增温作用有可能被探空仪观测到。     

华南后汛期降雨量的振动和分布

对１９５９至１９８８年华南后汛期（７－９月）降雨量距平百分率的大尺度变化特征进行了分析,并与前汛期（４－６月）降雨量的情况进行了比较,同时探讨了后汛期降雨量异常的成因。结果表明,华南后汛期雨量存在明显的年际变化,且地区差异显著;后汛期降雨量的异常与热带西太平洋的海水温度、南海地区大气的对流活动及登陆我国东南沿海地区的热带气旋的频数有关。     

黄山雪、雨凇和雾凇的气候特征

用黄山１９５６￣１９９６年气象资料,分析讨论了黄山雪,雨凇和雾凇的气候特点。结果表明：（１）年降雪日数,雨凇日数和雾凇日数均为多波振动的时间演变规律,年际变化具有阶段性,并存在准１２年周期的低频振荡。     

The medium-range variations of the summer monsoon circulation system over east asia

The Asian monsoon circulation system can be divided into two subsystems, i.e., the East Asian monsoon system(EA MS) and the Indian monsoon system (IMS). In this paper the main elements including the Indian monsoon trough, the South Asian high. the upper easterly jet etc. and the interactions between EAMS and IMS arc dealt with. The basic emphasis is put on the medium-range variations of the EAMS. Some significant results arc obtained.     

A method characterizing urban expansion based on land cover map at 30 m resolution

Based on the global land cover data at 30 m resolution (GlobeLand30) in the year 2000 and 2010, the urban expansion process of 320 cities in China was analyzed using lognormal regression, and the expansion model were established. Three metrics were presented for the models, including the peak position, the full width at half maximum, and the skewness. It was found that the three metrics could reveal different patterns of the urban expansion process of cities with different sizes. Specifically, cities with larger size tend to expand outward strongly, and their expansion intensity and influence are likely to be higher. Moreover, most cities’ expansion occurs around the urban core with spatially limited influence. In addition, it was also found that the city’s expansion intensity is related to the city size. These results showed that the lognormal regression model could describe the distribution of urban expansion with effectiveness and robustness.