广西钦州小董-板城上古生代硅质岩相地层

广西东南部钦州地区小董—板城一带发育一套由不同的硅质岩、硅质页岩和泥岩组成的地层，过去由很少大化石确定的地层划分、地质构造、空间分布和地层厚度等地质资料有很大的误差而不能再用。我们把这套地层分成三个组，石梯组（上泥盆统弗拉斯阶和法门阶），石夹组（下石炭统杜内阶和维宪阶）和板城组（上石炭统至上二叠统）。石梯组由放射虫Ｈｅｌｅｎｉｆｏｒｅｌａｔｉｃｌａｖｉｕｍ带和Ｈｏｌｏｅｃｉｓｃｕｓｆｏｒｅｍａｎａｅ带，牙形类Ａｎｃｙｒｏｄｅｌａａｌａｔａ带，Ｐａｌｍａｔｏｌｅｐｉｓｃｆ．ｇｉｇａｓ带，Ｐ．ｔｒｉａｎｇｕｌａｒｉｓ带，Ｐ．ｇｌａｂｒａｐｅｃｔｉｎａｔａ带组成。石夹组包括放射虫Ａｌｂａｉｌｅｌａｐａｒａｄｏｘａ带和Ａ．ｃａｒｔａｌａ带，牙形类Ｓｉｐｈｏｎｏｄｅｌａｄｕｐｌｉｃａｔａ带，Ｓ．ｃｏｐｅｒｉ带，Ｓｃａｌｉｏｇｎａｔｈｕｓａｎｃｈｏｒａｌｉｓ带和Ｇｎａｔｈｏｄｕｓ带。板城组含有放射虫Ｐｓｅｕｄｏａｌｂａｉｌｅｌａｎｏｄｏｓａ带，Ｐ．ｂｕｌｂｏｓａ带，Ｐ．ｕ－ｆｏｒｍａ－Ｐ．ｅｌｅｇａｎｓ带，Ｐ．ｌｏｍｅｎｔａｒｉａ－Ｐ．ｓａｋｍａｒｅｎｓｉｓ带，Ｐ．ｓｃａｌｐｒａｔａｍ．ｒｈｏｍｂｏｔｈｏｒａｃａｔａ带?

地层证据——对大别造山带汇聚历史的制约

大别造山带的汇聚演化历史一直存在不同的认识,来自扬子陆块和华北陆块显生宙以来的地层记录以及北淮阳地区的地层记录可能为两个陆块的汇聚模式提供制约。通过对扬子陆块与华北陆块显生宙以来岩相古地理进行比较,其中3个阶段相似,2个阶段差别很大。以浊积岩发育作为俯冲阶段的标志,磨拉石建造出现作为闭合的标志,显生宙以来,大别造山带曾经历了两次俯冲和两次汇聚,俯冲时间分别是晚奥陶世一早志留世和早三叠世,汇聚的时间分别为中-晚泥盆世和中三叠世,早期的汇聚具有软碰撞特征,以上认知得到了北淮阳地区地层、古生物和沉积记录的支持,同时也与大别山造山带榴辉岩的同位素年龄数据基本吻合。高压-超高压变质岩在晚三叠世处于快速折返阶段,早侏罗世以前到达地表,其平均折返隆升速率为3.9～6.6 mm/a。

羊拉铜矿里农矿段控矿因素及矿体分布规律

复杂的矿体空间分布影响矿山生产和找矿勘探。总结里农矿段控矿因素,重点分析主要矿体空间分布规律及地质背景,进一步指明找矿标志。

Stratigraphic framework of late Paleozoic in northeastern China

Late Paleozoic strata in northeastern China are distributed in a zonal pattern around the old-land on the Jiamusi-Mongolia Block. They are composed of active deposits in the regular distributed tectonic lithofacies zones. This indicates that the late Paleozoic strata belong to continental margin deposits. According to the strong conformability of the sedimentary strata in the same continental margin and distinct differences among the three continental margins, three stratigraphical regions of the Jiamusi-Mongolia Stratigraphical Province are recognized along the northern, southern and eastern margins of the Jiamusi-Mongolia Block, named respectively as Xing＇an Stratigraphical Region, Inner Mongolia grass-Songhua River Stratigraphical Region and Baoqing-Hunchun Stra- tigraphical Region. Due to the characteristics of continental margin deposits and active sediments, the strata can be correlated on the level of formation by the methods of analysing the rock association in the same stratigraphic region. Therefore, some revisions of the lithologieal formations of the late Paleozoic strata in northeastern China have been made, and a new chart of lithostratigraphic correlation has been proposed. Furthermore, the present stratigraphic framework is setting on the International Stratigraphic Chart on the level of stage, after comprehen- sive researches to lithostratigraphy, biostratigraphy and chronostratigraphy, especially the conodont biostratigra- phy and isotopic ages of volcanic rocks obtained in recent years.

Seismic volcanostratigraphy of large, extrusive complexes in continental rift basins of Northeast China：Analysis of general bedding patterns in volcanostratigraphy and their seismic reflection configurations

The aim of this work is to establish volcanic seismic reflection configuration models in the rift basins of Northeast China from a new perspective,the volcanostratigraphic structure.Accordingly,the volcanostratigraphic structure of an outcrop near the Hailaier Rift Basin was analyzed to understand the characteristics and causal factors of physical boundaries.Further,3D seismic reflection data and analysis of deep boreholes in the Songliao Rift Basin were used to establish the relationship between volcanic seismic reflection configurations and volcanostratigraphic structures.These studies suggested that in volcanic successions,physical boundaries coincide with volcanic boundaries,and their distributions are controlled by the stacking patterns of volcanic units.Therefore,volcanic seismic reflection configurations can be interpreted in terms of the stacking patterns of volcanic units.These are also referred to as general bedding patterns in volcanostratigraphy.Furthermore,four typical seismic reflection configurations were identified,namely,the chaotic,the parallel continuous,the hummocky,the multi-mound superimposed and the composite.The corresponding interpretation models comprised single massive unit,vertical,intersectional,lateral multi-mound,and composite stacking patterns.The hummocky and composite reflection configurations with intersectional and composite stacking patterns are the most favorable for the exploration of volcanic reservoirs in rift basins.

Petroleum exploration of shallow marine deposit Carboniferous volcanic tuff reservoir in the western margin of Junggar Basin

In 2011, petroleum exploration of shallow marine deposits Carboniferous and volcanic tuff reservoir re- alized breakthroughs at Chepaizi slope in the western margin of Junggar Basin. Pal 61 well, with 855.7 949.6 m section, in the conventional test oil obtained 6 t/d industrial oil flow. The surface viscosity is 390 mPa. s （50 ℃）. The marine deposit of Carboniferous are deep oil source rocks and high-quality reservoir. Magma volcanic activity provides the basis for volcanic reservoir development and distribution. The weathering crust and secondary cracks developed volcanic tuff by strong rock weathering and dissolution of organic acids which has become top quality reservoir. Deep Permian oil-gas migrated and accumulated to high parts along Hong-Che fault belt and stratigraphic unconformity stripping. Permian and Triassic volcanic rocks or dense mudstone sedimentary cover as a regional seal for the late Carboniferous oil-gas to save critically. The seismic pre-stack time migration processing technologies for the problem of poor inner structures of Carboniferous were developed. Response of volcanic rock seismic and logging are obvious. The application imaging logging and nuclear magnetic technology achieved the qualitative identification and quantification of fracture description.

Onset of the Kwangsian Orogeny as evidenced by biofacies and lithofacies

The onset timing of the Kwangsian Orogeny might differ among localities across South China.Refined stratigraphic works at different localities are necessary to reveal the details of this likely distinction.Recently,we recollected some graptolite specimens from the Ordovician Shixing and Longtouzhai formations(corresponding to the Longxi Formation of southern Jiangxi Province) at many localities in Guangdong Province.The palaeontological and biostratigraphical studies of these graptolite faunas indicate that the facies change from graptolitic shale to nearshore shallow-water,coarse clastics in Guangdong is slightly earlier than that in southern Jiangxi.This timing difference may imply a northward progression of the Kwangsian Orogeny.Based on the biostratigraphy and palaeontology of the Ordovician in the Zhujiang Basin(western part) and Chiangnan Slope Belt(including western Fujian,eastern Guangdong,northern Guangxi,northern Hunan,northeastern Jiangxi,southern Anhui,and western Zhejiang),the Sandbian to late Katian distribution and replacement of biofacies and lithofacies in the two regions are proposed and discussed,which display distinct features at different stages of the Kwangsian Orogeny.

Temperatures of dolomitizing fluids in the Feixianguan Formation from the Northeastern Sichuan Basin

The discovery of natural gas reservoirs from the Triassic Feixianguan Formation in the Northeastern Sichuan Basin is an important breakthrough in the field of marine carbonate rocks for Chinese oil and gas exploration in recent years.Because of the dolomite-hosted reservoirs in the Feixianguan Formation,these dolomites and their formation mechanisms have been a research focus for sedimentary geologists and petroleum geologists.Based on the homogenization temperatures of fluid inclusions,oxygen isotopic composition and their calculated temperatures,and the burial and thermal history of the typical well,it is considered that the majority of dolomites are formed by low-temperature dolomitizing fluids in the Triassic Feixianguan Formation,Northeastern Sichuan Basin.Only a minority of dolomites are formed by high-temperature dolomitizing fluids.The ending depth interval of low-temperature dolomitizing fluids was about 1000-2500 m,of which the correspondingly ending timing interval was approximately from early-middle Middle Triassic to early-middle Late Triassic.The main depth interval of high-temperature dolomitizing fluids was about 3200-4500 m,of which the correspondingly main timing interval was approximately early-middle Middle Jurassic.The low-temperature and high-temperature dolomitizing fluids have different meanings to the formation and evolution of the pore volumes of dolomite reservoirs in the Feixianguan Formation,Northeastern Sichuan Basin.