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Distribution and genesis of secondary pores in Paleogene clastic reservoirs of Beidagang structural belt in the Huanghua depression

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Mining Science and Technology 2010年第1期20卷 115-120页

作者： SU Nina, JIN Zhenkui, SONG Fan Faculty of Natural resource and information Technology, china university of petroleum, beijing 102.49, china Faculty of Natural resource and information Technology China University of Petroleum Beijing 102249 China

The distribution and genesis of secondary pores in Paleogene clastic reservoirs of Beidagang structural belt in the Huanghua depression have been systematically studied. We investigated sedimentary facies and carried out a comprehensive analy-sis of the vast amount of data from casting thin sections, scanning electron microscope and physical data. Then we analyzed the pore types, pore evolution, distribution and genesis of secondary pores in our study area and discussed the factors controlling the distribution of secondary pores. The results show that pores in the study area are largely composed of intergranular dissolution pores and constituent dissolved pores. Three secondary pore zones were developed in the study area at depths of 2800~3400 m, 3600~4200 m and 4500~4800 m. Secondary pores have been formed mainly because carbonate cement, feldspar, clastic debris and other plastic substances were dissolved by organic acid, released during the evolution of organic matter and acid water formed by CO2. The development and distribution of secondary pores are vertically controlled by the maturity time of source rocks and hori-zontally by the distribution of acid water. As well, this distribution was affected by the sedimentary facies belt and the development of fault zones.

关键词： Huanghua depression Beidagang structural belt Paleogene clastic reservoirs secondary pores controlling factor

Effects of boundary conditions on vibrating mode of acoustic logging dipole transducer

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Science china Earth Sciences 2008年第S2期51卷 195-200页

作者： QIAO WenXiao,CHE XiaoHua & ZHANG Fei State Key Laboratory of petroleum resource and Prospecting,china university of petroleum,beijing 102.49,china State Key Laboratory of petroleum resource and Prospecting China University of Petroleum Beijing China

Acoustic transducer is an important part of acoustic well logging tool. In this paper,ANSYS software package is used to design acoustic dipole transducer and simulate vibrating mode of the dipole transducer in different mechanical boundary conditions. The results show that boundary conditions influence the number of vibrating mode in the same frequency band and the frequency value of the same vibrating mode. Several acoustic dipole transducers are designed according to the results of numerical simulation and laboratory measurements. The basic frequency of vibrating mode of experi-ment has good agreement with that of simulation. The numerical simulation plays a good guidance role in designing,producing and correctly installing the acoustic dipole transducer.

关键词： acoustic dipole transducer vibrating mode basic frequency acoustic well logging

Wide/narrow azimuth acquisition footprints and their effects on seismic imaging

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petroleum Science 2008年第4期5卷 308-313页

作者： Di Bangrang Xu Xiucang Wei Jianxin Key Laboratory of CNPC Geophysical Exploration China University of Petroleum Beijing 102249 China State Key Laboratory of petroleum resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory of Earth Prospecting and information Technology China University of Petroleum Beijing 102249 China

Acquisition footprint is a new concept to describe the seismic noise in three-dimensional seismic exploration and it is closely related to geometry and observation shuttering. At present, the study on acquisition footprints has become a hot spot. In partnership with the Dagang Oilfield, we used the channel sand body seismic physical model to study the characteristics of wide/narrow azimuth acquisition footprints and analyzed and compared the two types of footprints and their effects on target imaging. In addition, the footprints caused by data processing of the normal moveout offset （NMO） stretching aberration were discussed. These footprints are located only in the shallow or middle layer in the time slice, and possibly affect the imaging of shallow target layers, and have no influence on deep target imaging. Seismic physical modeling has its advantages in the study of acquisition footprints.

关键词： Wide/narrow azimuth geometry acquisition footprint stretching aberration time slice seismic imaging

Characteristics of Ore-Forming Fluids of Gold Deposits in Daqingshan District,Inner Mongolia,china

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International Journal of Minerals,Metallurgy and Materials 1999年第2期13卷 77-82页

作者： Jiuhua Xu YulingXie Dayi Qian Rufu Dine Jianping Li (resource Engineering school, university of Science and Technology Beijha beijing 100083, china) (china university of Geosciences, beijing 100083, china) resource Engineering school University of Science and Technology Beijing Beijing 100083 China china university of Geosciences Beijing 100083 China

***-weststrikingductileshearzonewithinagreelt,***:(1)pyrite-quartz,(2)quartz-Pyrite,(3)polymetallicsulfidesand(4)***-bearingveinsarenativegold,electrum,pyrite,chalcopyriteandgalena,buttheganguemineralsaremainlyquartz,secondarilysericite,***,silicification,***-formingfluidswerelowinsalinitieandhighinCO2content,MeasuredδDoffluidinclusionsinquartzfromtheoreveinsrangesfrom-65‰to-104‰,butδ18Oquartzfrom10.0‰to12.8‰.Thesedatashowthatthewaterinhydrothermalfluidprecipitatingtheorebodiescouldhavebeenmainlymagmaticwaterandmetamorphicwaterbutlocalmeteoricwatermighttakepartinthelatemineralization.δ13Cfromfl

关键词： fluid inclusions isotope composition gold deposit Daqingshan area

Purposeless repeated acquisition time-lapse seismic data processing

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petroleum Science 2008年第1期5卷 31-36页

作者： Li Jingye Chen Xiaohong Zhao Wei Zhang Yunpeng Key Laboratory for Hydrocarbon Accumulation Mechanism Ministry of Education China University of PetroleumBeijing 102249 China Basin ＆ Reservoir Research Center China University of Petroleum Beijing 102249 China school of resource and information China University of Petroleum Beijing 102249 China Research Center of CNOOC Beijing 100027 China

In china, most oil fields are continental sedimentation with strong heterogeneity, which on one side makes the reservoir prospecting and development more difficult, but on the other side provides more space for searching residual oil in matured fields. Time-lapse seismic reservoir monitoring technique is one of most important techniques to define residual oil distribution. According to the demand for and development of time-lapse seismic reservoir monitoring in china, purposeless repeated acquisition time-lapse seismic data processing was studied. The four key steps in purposeless repeated acquisition time-lapse seismic data processing, including amplitude-preserved processing with relative consistency, rebinning, match filtering and difference calculation, were analyzed by combining theory and real seismic data processing. Meanwhile, quality control during real time-lapse seismic processing was emphasized.

关键词： Time-lapse seismic purposeless repeated acquisition rebinning match filtering amplitude-preserved processing

Neutron and density logging responses to gas reservoir for well-balanced and under-balanced logging:Gas reservoirs of sandstone in a western china field

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Science china Earth Sciences 2008年第S2期51卷 201-206页

作者： WU WenSheng1,XIAO LiZhi1 & ZHANG LongHai2 1 resource & information Department,china university of petroleum,beijing 102.49,china 2 Research Institute of petroleum Exploration and Development,Petrochina,beijing 100083,china resource & information Department China University of Petroleum Beijing China Research Institute of petroleum Exploration and Development PetroChina Beijing China

Studying the response differences between neutron and density logging of gas reservoir for well-balanced and under-balanced logging will be of significance in evaluation of gas reservoir under the under-balanced condition and application of logging data. With Monte Carlo simulation technique,the paper obtains the relationship between neutron and density logging measurement and borehole di-ameter,porosity or gas saturation for well-balanced and under-balanced logging. The conclusions show that the response trend of under-balanced logging to gas reservoirs agrees with that of well-balanced logging with small borehole,and under-balanced logging data can be used usually as well-balanced logging data. When borehole diameter is large,under-balanced logging data should be corrected for the influences of borehole.

关键词： under-balanced logging density logging neutron logging gas reservoir response

Structural characteristics of the Tan-Lu fault zone in Cenozoic basins offshore the Bohai Sea

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Science china Earth Sciences 2008年第S2期51卷 20-31页

作者： QI JiaFu1,2,ZHOU XinHuai3,DENG RongJing4 & ZHANG KeXin2 1 State Key Laboratory of petroleum resource and Prospecting,china petroleum university,beijing 102.49,china 2 Department of Earth Sciences,china petroleum university,beijing 102200,china 3 Tianjin Branch of CNOOC china Limited,Tianjin 300451,china 4 beijing Research Center of CNOOC china Limited,beijing100027,china State Key Laboratory of petroleum resource and Prospecting China Petroleum University Beijing China Department of Earth Sciences China Petroleum University Beijing China Tianjin Branch of CNOOC china Limited Tianjin China beijing Research Center of CNOOC china Limited Beijing China

The Tan-Lu fault zone across the eastern margin of the Cenozoic basins offshore the Bohai Sea is a NNE-trending right-lateral strike-slip fault system developed in the Cenozoic basin cover. It cuts through NE-to NNE-striking major extensional faults that controlled the formation of Paleogene basins. Recent petroleum exploration indicates that Cenozoic structural activities of the Tan-Lu fault system have directly or indirectly affected oil and gas distribution offshore the Bohai Sea. As part of a deep fault zone the Tan-Lu fault zone has been activated since the Oligocene,and obviously affected the tectonic evolution of offshore Bohai basins since then. The formation of Paleogene rift basins offshore the Bohai Sea has utilized the pre-existing structural elements of the Tan-Lu fault zone that developed in the late Mesozoic.

关键词： strike-slip fault extensional structure Tan-Lu fault zone Bohaiwan basin

Wave coupling between the Tianshan orogen and the deformations in its south and north foreland basins in Cenozoic

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Science china Earth Sciences 2008年第S2期51卷 61-69页

作者： CHEN ShuPing1,2,TANG LiangJie & YU YiXin1,2 1 State Key Laboratory of petroleum resource and Prospecting,china university of petroleum,beijing 102.49,china 2 Department of Geoscience,china university of petroleum,beijing 102.49,china State Key Laboratory of petroleum resource and Prospecting China University of Petroleum Beijing China Department of Geoscience China University of Petroleum Beijing China

Attention has been paid to the deformations in the south and north foreland basins of the Tianshan Mountains and their relations to the tectonic movements of the mountains. Based on the seismic data interpretation and field work,the tectonic features,tectonic styles,controlling factors of deformation,deformation time,and their relationships in the three tectonic units were comparably studied. The Ce-nozoic deformations in the two foreland basins were characterized by zonation from south to north,segmentation from west to east,and layering from deep to shallow. The tectonic styles are compres-sive ones,including both basement-involved and cover-detaching. The two foreland basins underwent several times of deformation in Cenozoic and the deformations were transmitted from the Tianshan orogen to the inner basin. The deformation dynamics of the south and north foreland basins of the Tianshan Mountains can be represented by dynamics of orogenic wedges. In terms of the deformations of the wedges with wave-like features,the concept of a wave orogenic wedge was put forward,and a double wave orogenic wedge model was established.

关键词： Tianshan orogen basin-mountain coupling tectonics wave orogenic wedge

Multi-level decollement zones and detachment deformation of Longmenshan thrust belt,Sichuan Basin,southwest china

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Science china Earth Sciences 2008年第S2期51卷 32-43页

作者： TANG LiangJie1,2,3,YANG KeMing4,JIN WenZheng1,2,3,L ZhiZhou4 & YU YiXin1,2,3 1 State Key Laboratory of petroleum resource and Prospecting,china university of petroleum,beijing 102.49,china 2 Key Laboratory for Hydrocarbon Accumulation Mechanism,china university of petroleum,Ministry of Education,beijing 102.49,china 3 Basin and Reservoir Research Center,china university of petroleum,beijing 102.49,china 4 Southwest Division Company,SINOPEC,Chengdu 610081,china State Key Laboratory of petroleum resource and Prospecting China University of Petroleum Beijing China Key Laboratory for Hydrocarbon Accumulation Mechanism China University of Petroleum Ministry of Education Beijing China Basin and Reservoir Research Center China University of Petroleum Beijing China Southwest Division Company SINOPEC Chengdu China

As is well known that many decollement layers were developed in the Longmenshan thrust belt,Si-chuan Basin,china. Through field investigation,explanation of seismic profiles and analysis of the balanced sections,we can divide the decollement zones into 3 categories: (1) the deep level decolle-ment zones,including the crust-mantle decollement layer,intracrustal decollement layer,and presinian basal decollement layer. The main structural styles of their deformation are the crust-mantle decoup-ling detachment deformation,the basal ductile shear deformation,etc.; (2) the middle level decollement zones,including the Cambrian-Ordovician decollement layer,the Silurian decollement layer,etc.,the main structural styles of their deformation are the isopachous fold,the angular fold,the saddle struc-ture,and the combination styles of them; and (3) the shallow level decollement zones,including the Xujiahe Formation decollement layer of Upper Triassic and the Jurassic decollement layers,the main structural styles of their deformation are the thrust-nappe tectonic,the pop-up,the triangle zone ,the duplex,etc. Multi-level decollement zones not only made the Longmenshan thrust belt develop many different deformation styles from deep place to shallow place,but also made some local areas have the superimposition of the tectonic deformation apparently. This study indicates that the multi-level de-collement zones have a very important effect on the shaping and evolution of the Longmenshan thrust belt.

关键词： decollement layer structural styles multi-level decollement zones Longmenshan thrust belt