胶莱盆地白垩纪构造应力场与转换机制

通过对胶莱盆地断层滑动矢量的收集与测量,利用计算机程序反演了盆地白垩纪的古构造应力场演化历史,并据此将盆地的发育划分为三个伸展阶段和三个挤压反转阶段,分别为早白垩世早-中期莱阳期伸展,与造山期后应力松弛重力坍塌有关;早白垩世中-晚期青山期伸展,受早白垩纪早期以后广泛的岩石圈减薄、大陆裂陷制约;晚白垩世王氏期伸展,与郯庐断裂及牟平-即墨断裂右旋走滑有关。三期伸展之间存在构造挤压反转,最后阐明各期盆地发育的地球动力学背景。     

柴达木北缘滩间山群时代及其地质意义

滩间山群是柴北缘早古生代重要的火山-沉积建造。基于野外地质特征、古生物组合、同位素年龄、构造-热事件等的综合分析,本文认为滩间山群形成于早-晚奥陶世,时限496~440Ma,与该区超高压变质作用不同步,后者时限545~485Ma。新的滩间山群火山-沉积建造序列表明,柴北缘从新元古代-早古生代可能存在两次构造开合演化过程。     

四川盆地新场气田须家河组二段储层评价

新场气田位于四川盆地西部,是川西地区主力气田之一。通过对该区多口井的岩石学以及电性、物性特征进行分析研究,认为须家河二段储层岩石类型复杂,储集空间类型多样,储层平均孔隙度3.17%,平均渗透率2.78×10-3μm2,为典型的低孔低渗特征,根据气田须二段储层的特点,结合孔渗关系曲线以及含气性等参数,对该区储层进行分类评价,认为Ⅲ类储层是须家河组中主要的储层类型,并对该区天然气有利富集区的平面展布规律进行综合评价。     

Palynostratigraphy of the Erkovtsy field of brown coal (the Zeya-Bureya sedimentary basin)

The Erkovtsy brown coal field in the northwestern Zeya-Bureya sedimentary basin (129°–130° E, 46°–47° N) is structurally confined to southern flank of the Mesozoic-Cenozoic Belogor’e depression. The verified stratigraphic scheme of the coalfield sedimentary sequence is substantiated by palynological data on core samples from 18 boreholes sampled in the course of detailed prospecting and by paleobotanical analysis of sections in the Yuzhnyi sector of the coalfield (data of 1998 by M.A. Akhmetiev and S.P. Manchester). Sections of the Erkovtsy, Arkhara-Boguchan, and Raichikha brown-coal mines are correlated. Stratigraphic subdivisions distinguished in the studied sedimentary succession are the middle and upper Tsagayan subformations (the latter incorporating the Kivda Beds), Raichikha, Mukhino, Buzuli, and Sazanka formations.     

Fairweather atmospheric electricity at Antarctica during local summer as observed from Indian station,Maitri

Surface measurements of the atmospheric electrical parameters like Maxwell current, electric field and conductivity studied at the Indian station, Maitri (70.75° S, 11.75° E, 117 m above mean sea level), Antarctica, during austral summer have been analyzed for the years 2001 to 2004. A total of 69 days were selected which satisfied the ‘fairweather’ conditions, i.e., days with absence of high winds, drifting or falling snow, clouds, and fog effects. The diurnal variation curve of electric field and vertical current averaged for 69 fairweather days is a single periodic with a minimum at 03:00 UT and a maximum near 19:00 UT, which is very similar to the Carnegie curve. The correlation coefficient between these measured parameters has a high value (more than 0.9) for all the days. During fairweather days the measured current and field variations are similar and hence it is clear that the conductivity is more or less stable. During magnetically disturbed days, the dawn-dusk potential drop has clear influences on the diurnal variation and it modifies the conductivity. Apart from the day-to-day variation in low latitude thunderstorm activity, there are diurnal, seasonal, inter-annual variations in the electric potential and the currents, as well as solar influences on the measured parameters. This study will help us to examine the impact of solar and geophysical phenomena like solar flares, geomagnetic storms and substorms on the global electric circuit.     

Dominant factors in controlling marine gas pools in South China

In marine strata from Sinian to Middle Triassic in South China, there develop four sets of regional and six sets of local source rocks, and ten sets of reservoir rocks. The occurrence of four main formation periods in association with five main reconstruction periods, results in a secondary origin for the most marine gas pools in South China. To improve the understanding of marine gas pools in South China with severely deformed geological background, the dominant control factors are discussed in this paper. The fluid sources, including the gas cracked from crude oil, the gas dissolved in water, the gas of inorganic origin, hydrocarbons generated during the second phase, and the mixed pool fluid source, were the most significant control factors of the types and the development stage of pools. The period of the pool formation and the reconstruction controlled the pool evolution and the distribution on a regional scale. Owing to the multiple periods of the pool formation and the reconstruction, the distribution of marine gas pools was complex both in space and in time, and the gas in the pools is heterogeneous. Pool elements, such as preservation conditions, traps and migration paths, and reservoir rocks and facies, also served as important control factors to marine gas pools in South China. Especially, the preservation conditions played a key role in maintaining marine oil and gas accumulations on a regional or local scale. According to several dominant control factors of a pool, the pool-controlling model can be constructed. As an example, the pool-controlling model of Sinian gas pool in Weiyuan gas field in Sichuan basin was summed up.     

刚毛柽柳种子萌发对盐分与干旱胁迫的响应

通过对不同温度、盐分和干旱胁迫对刚毛柽柳种子萌发实验研究影响,结果表明:刚毛柽柳种子的适宜萌发温度范围为10~35℃,萌发率高达80%以上,且萌发迅速。不同浓度NaCl溶液对刚毛柽柳种子萌发有明显抑制作用,种子萌发率随NaCl溶液浓度的增大而下降,到0.7 mol/L时,萌发率仅为1.67%,种子发芽受到抑制。相同渗透势PEG-6 000溶液中的萌发率低于NaCl溶液,渗透势为-0.5 MPa是二者影响作用的分界点。渗透势为-1.8 MPa时,萌发率已急剧下降到0,其对种子萌发的抑制作用大于NaCl溶液。将在两溶液中处理10天的种子转移至蒸馏水后,随着NaCl溶液浓度的增大,萌发恢复率逐渐升高,0.7 mol/L时,萌发恢复率为60%;随着PEG-6 000溶液浓度增大,萌发恢复率先升高后降低,渗透势为-1.4 MPa时,种子萌发恢复率达到最大为67.5%,但两种处理下种子的最终萌发率(总萌发率)都低于在蒸馏水中的。