JOURNAL OF OIL AND GAS TECHNOLOGY
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JOURNAL OF OI L AND GAS TECHNOLOGY
Vo1.34 No.9 Sep.2012
MAlN ABSTRACTS
1 6 1 Sedimentary Characteristics and Exploration Significance of Shallow-water Delta
SU ̄Zuo—xing,ZHANG Yi—na,LIU Chang-li,LI Ming-gang(First Author s Address:Research Institute o,Petroleum E.rplo—
ration and Development,PetroChina,Beijing 100083,China) Abstract:The major contro1 factors,sedimentary characteristics,distribution rules,distribution modes and accumulation
characteristics of shallow一.water delta were summarized by systematically investigating and analyzing a 1arge number of
shallow—water deltas at home and abroad.The result indicates that steady structure,gentle terrain,shallow water,cy—
clic deep water,warm and humid climate,adequate source were favorable for the formation of shallow—water delta.The
shallow—water delta had a specia1 sedimentary microfacies and distribution mode。plane facies belt was complete.it was
dominated by underwater branch river.It can be two shallow delta modes:ramous distributary channel and lobate retic—
ular distributary bars.Shallow delta possesses favorable assemblage of storage and caprock,good accumulation and
preservation condition。it provides a new area of lithologic reservoirs and a new battlefield for oi1 and gas exploration.
Key words:shallow—water delta;geological background;sedimentary characteristics;distribution mode;exploration sig—
nificance.
1 6 6 Characteristics and Analysis on Main Controlling Factors of Chang 8 Reservoir with Utra-low Permea-
bility in Heshui Area
FU Wen-yao,REN Xia-hong,XU Han-wen,WU De-zhf (FirstAuthor s Address:First ProiP(ts Department of Ertra low
Permeability Reservoirs,C^angqing 0ilfield Cornpany,Heshui 745lO0,Gansu,China) Abstract:Based on logging data and data of core observation and cast thin section,tile petrologic1 characteristics,pore
throat characteristics and diagenesis of Chang 8 Reservoir in Heshui Area were studied.The result shows that Chang 8
Reservoir belongs to low and ultra—low porosity and permeability reservoir:the main 1ithlogy is fine grained lithic arkose
and arkose:the reservoir mainly developes intergranular pore and dissolved pores.The reservoir properties are influ—
enced by sedimentation and diagenesis. Key words:Heshui Area;Chang 8 Reservoir;low and ultra—low permeability reservoir;main controlling factors
1 7 3 Discussion on Kedon ̄Structural Mode in the West Kunlun Mountain Front of Tarim Basin
uA ̄G l ong,ZHA ̄G dian—wei,HA~Chang-wei, ~G Yang (First Author’s Address:GWD(2 Mud—log Company,CNPC,
PⅡ in 124010,Liaoning,China) Abstract:Based on seismic data,combined with seismic data,drilling,outcrop,field survey,digital sand box simula—
tion experimental results and other information and as wel1 as regiona1 geological features,the nature and distribution
characteristics of the major faults of Kedong tectonic belt of western Kunlun piedmont in Tarim Basin were basically clarified:It was considered that the fractures were mainly of basement—involved type of fracture which had a upper steep
portion and 1ower flat portion.and concealed structure which was developed in the down-dip of the compressiona1 fault
was favorable target of exploration.The plane segmented characteristics of Kedong tectonic zone is determined.the ad—
iusting fault is divided into three segments from east to west,and it is pointed out that the trap size is relatively 1arge in the west and east,middle traps are 1ess developed.oil and gas exploration should break through the eastern section for
exploration in the west and preparation fro the middle section.
Key words:Kedong tectonic zone;structural feature;fault
1 7 7 Geological and Regional Selection of Shale-gas in Lower Jurassic of Sichuan Basin Based on Comprehen—
sive Fuzzy Evaluation -
RE ̄Lei,DOU Bin,LIU Guo-liang,ZHU Shan—shan(First Author’ Address:College of Engineering,China University of Geosciences,W han 430074,Hubei,C^ina) Abstract:Sichuan Basin was an important oil—gas association basin in China.Ziliujing Formation in I ower Jurassic was mainly composed of a set of deep Iake—serei deep lake facies deposits。where black shale was well developed。it had the
characteristics of wide distribution and high organic carbon content,it had a basic geological conditions of forming shale
gas.13ecause shale gas industry was still at primary stage in our country・ItS evaluation system was not yet estab—
fished.Based on the standards of marine shale gas evaluation system in Northern America,combined with the character
istics of shale gas accumulation in Lower Jurassic,organic carbon content,maturity and 7 other indexes were selected as evaluation factors.The comprehensive evaluation of shale gas in Lower Jurassic is evaluated by establishing compre—