高陂区童子岩组沉积与聚煤特征

从野外第一手资料入手,分析了本区的童子岩组第三段中亚段的沉积特征。在此基础上,归纳出本区主采煤层沉积环境,并研究了主采煤层的聚煤特征。     

Beds comprising debrite sandwiched within co-genetic turbidite: origin and widespread occurrence in distal depositional environments

Co‐genetic debrite–turbidite beds occur in a variety of modern and ancient turbidite systems. Their basic character is distinctive. An ungraded muddy sandstone interval is encased within mud‐poor graded sandstone, siltstone and mudstone. The muddy sandstone interval preserves evidence of en masse deposition and is thus termed a debrite. The mud‐poor sandstone, siltstone and mudstone show features indicating progressive layer‐by‐layer deposition and are thus called a turbidite. Palaeocurrent indicators, ubiquitous stratigraphic association and the position of hemipelagic intervals demonstrate that debrite and enclosing turbidite originate in the same event. Detailed field observations are presented for co‐genetic debrite–turbidite beds in three widespread sequences of variable age: the Miocene Marnoso Arenacea Formation in the Italian Apennines; the Silurian Aberystwyth Grits in Wales; and Quaternary deposits of the Agadir Basin, offshore Morocco. Deposition of these sequences occurred in similar unchannellized basin‐plain settings. Co‐genetic debrite–turbidite beds were deposited from longitudinally segregated flow events, comprising both debris flow and forerunning turbidity current. It is most likely that the debris flow was generated by relatively shallow (few tens of centimetres) erosion of mud‐rich sea‐floor sediment. Changes in the settling behaviour of sand grains from a muddy fluid as flows decelerated may also have contributed to debrite deposition. The association with distal settings results from the ubiquitous presence of muddy deposits in such locations, which may be eroded and disaggregated to form a cohesive debris flow. Debrite intervals may be extensive (> 26 × 10 km in the Marnoso Arenacea Formation) and are not restricted to basin margins. Such long debris flow run‐out on low‐gradient sea floor (< 0·1°) may simply be due to low yield strength (? 50 Pa) of the debris–water mixture. This study emphasizes that multiple flow types, and transformations between flow types, can occur within the distal parts of submarine flow events.     

长江口深水航道治理工程综述

文章概要地介绍长江口深水航道治理工程的规划、勘察、设计和施工情况，对整治方案及主要岩土工程问题略作讨论。     

新疆煤层气资源赋存特征及开发潜力分析

通过对新疆主要煤田的煤炭资源分布特征，煤变质特征及构造特征分析，探讨新疆的煤层气资源赋存特征，对新疆主要煤田煤层气资源的勘探开发潜力进行初步评价，新疆的煤层气基本属于少生中储型，虽然单位含气量较低，但煤炭资源非常丰富，且相对集中，煤气具有较大的勘探开发潜力。     

Review of the Tropical Gyre in the Indian Ocean with Its Impact on Heat and Salt Transport and Regional Climate Modes

Due to the IO monsoon impact, the tropical IO circulation has significant seasonal variation, especially in the northern IO. However, in mean-state, a relatively closed current loop is established by eastward current along the equator and westward current south of equator, which is regarded as Tropical Gyre in the Indian Ocean. Based on this circulation system, relevant studies were reviewed. Its impact on heat and salt transports and regional climate changes were discussed.     

舒兰煤田水曲柳区煤层气分布规律及利用方向浅析

舒兰煤田水曲柳区煤层气在平面上富气中心分布与富煤中心一致。该区煤层气属特低丰度、中等埋深的小型煤气田。适宜井下瓦斯抽采。可在建井后,在瓦斯富集部位煤层底板岩巷中,采用钻孔抽采方式,可回收近1.8亿m3煤层气,不但提高了资源的利用率,还将减少环境污染,提高了煤矿生产安全度,具有显著的经济意义和社会效益。     

New Thoughts of Comprehensive Development and Utilization of Salt Lake Resources in Qinghai Province

正Qinghai Province has unique salt lake resources in China characterized by multicomponent,big storage,multi types and easy exploitation.These salt lake resources are concentrated in Qaidam Basin.     

利用单渗砂层能量厚度研究有利沉积微相及其含油有利区的方法

针对鄂尔多斯盆地陕北斜坡中部特低渗透储层识别主体骨架砂体微相带及筛选含油有利区工作,提出利用单渗砂层能量厚度控制划分最为有利的沉积微相带。利用多种测井响应提取单渗砂层沉积能量及其能量厚度信息,使其曲线幅度、厚度、形状、接触关系、次级形态等特征和数据大小能够集中反映相对高渗的单渗砂层最大沉积能量及厚度变化,确认出三角洲前缘水下分流河道微相及其河道叠置型河口坝微相骨架砂体的发育、规模及分布范围,有效地克服了层段中几个成因相近薄砂层或砂泥互层中砂层累加厚度识别和划分主体骨架砂体微相带的失误。通过该区目的层段自然电位、自然伽马、密度、中子、声波、电阻率测井曲线和岩性、物性及其能量厚度统计,建立起单渗砂层能量厚度下限标准及夹层扣除标准,在该区长4+511特低渗透储层中提取单渗砂层及其沉积能量信息,控制划分出有利沉积微相带及其骨架砂体分布,预测和筛选出不同类型相对高渗高产含油有利区,它们不同程度勾画出河道主体带油藏与南西部华池油藏连片延伸趋势、形态和特征,为该区特低渗透油田增储上产提供有利目标和重点层位及井区。     

The red bed controversy revisited: shape analysis of Colorado Plateau units suggests long magnetization times

Several Triassic and earliest Jurassic sedimentary units from the Colorado Plateau region have distributions of virtual geomagnetic poles (VGPs) that are highly elongate along the path of apparent polar wander (APW). This suggests that the remanent magnetizations measured in these units were acquired over an extended period of time, possibly approaching 35 m.y., and are not precisely coeval with the stratigraphic age of the rock. Comparison with other paleomagnetic studies shows that the observed elongation is not a general attribute of the age of the rock, nor is it related to paleolatitude. The rocks that yield elongate VGP distributions are dominantly red to brown mudstones, and it is possible that their remanence is dominated by a slowly acquired chemical remanent magnetization, as suggested by Larson et al. [J. Geophys. Res. 87 (1982) 1081] and other authors. However, several superficially similar units from the Colorado Plateau have nearly circular VGP distributions. The process by which remanence is acquired in clastic sedimentary rocks merits further study.     

Correlation of Aptian-Albian sediments in the central part of North Caucasus and Ciscaucasia. Paper 2: Stratigraphy

A complex correlation between outcrops and well sections was performed for the central part of North Caucasus and Ciscaucasia using geophysical, biostratigraphic, and lithostratigraphic methods with new substage and zonal division of the Aptian and Albian sediments taken into account. Previously recognized local subsidiary stratigraphic units (members) were traced into the covered areas, and the stratigraphic position of productive layers was specified.