發(fā)布時間：2018-11-08 08:25

【摘要】：對柴達(dá)木盆地東北緣石炭系地層中生物礁的發(fā)育特征及區(qū)域展布進(jìn)行了系統(tǒng)闡述。基于野外實地考察與室內(nèi)鏡下分析,采用地球化學(xué)與巖石學(xué)方法相結(jié)合,總結(jié)歸納柴達(dá)木盆地東北緣石炭系生物礁的巖石學(xué)特征、生物特征以及地層特征,分析生物礁主要產(chǎn)出層位及規(guī)模大小,探討其古環(huán)境與油氣地質(zhì)意義。研究結(jié)果表明:柴達(dá)木盆地東北緣石炭系造礁生物主要為四射珊瑚,其次為橫板珊瑚,發(fā)育錐狀、盤狀的單體珊瑚和管狀、叢狀、蜂窩狀的群體珊瑚,附礁生物為腕足、等;珊瑚礁在巖層中以點狀產(chǎn)出,呈不連續(xù)帶狀分布,依據(jù)其在地層中的發(fā)育規(guī)律與展布特征,分為簇狀豎直叢生管狀珊瑚、簇狀水平延伸管狀珊瑚以及簇狀頂端向下傾斜管狀珊瑚;根據(jù)巖石中的生物顆粒含量,生物礁灰?guī)r儲層巖石類型分為珊瑚骨架灰?guī)r、珊瑚顆粒石灰?guī)r、生物顆粒質(zhì)石灰?guī)r、含生物顆粒石灰?guī)r以及泥晶灰?guī)r。柴達(dá)木盆地東北緣早石炭世以碳酸鹽臺地環(huán)境為主,晚石炭世以海陸交互的潮坪環(huán)境為主。研究區(qū)石炭系生物礁主要位于下石炭統(tǒng)懷頭他拉組三、四段,在石灰溝、旺尕秀等剖面可見厚層油砂,指示柴達(dá)木盆地東北緣石炭系具有良好的生烴潛力。
[Abstract]:The development characteristics and regional distribution of reefs in Carboniferous strata in the northeastern margin of Qaidam Basin are systematically described. Based on field investigation and laboratory microscopic analysis, the petrological characteristics, biological characteristics and stratigraphic characteristics of Carboniferous reefs in the northeastern margin of Qaidam Basin are summarized by combining geochemistry and petrology. The main productive horizon and scale of the reef are analyzed, and its paleoenvironment and geological significance of oil and gas are discussed. The results show that the reef organisms of Carboniferous in the northeastern margin of Qaidam Basin are mainly Tetraeuca, followed by transverse-plate coral, conical, disklike and tubular, plexiform, honeycomb colony coral, brachiopod, etc. Coral reefs are distributed in discontinuous zones in the form of dots. According to their development and distribution characteristics, coral reefs are divided into cluster vertical tube-shaped corals. Cluster-like horizontal extended tubular corals and tube-shaped corals with tube-shaped tip and downward tilt; According to the biological particle content in the rock, the rock types of the reef limestone reservoir can be divided into coral skeleton limestone, coral granular limestone, biological granular limestone, biogranular limestone and marl limestone. In the northeast margin of Qaidam Basin, the carbonate platform environment was dominant in the early Carboniferous and the tidal flat environment in the late Carboniferous. Carboniferous reefs are mainly located in the third and fourth member of Huitoutala formation of Lower Carboniferous in the study area. Thick oil sand can be seen in the sections of Limegou and Wanggarxiu, indicating that Carboniferous has good hydrocarbon generation potential in the northeast margin of Qaidam Basin.
【作者單位】： 中國石油大學(xué)(華東)地球科學(xué)與技術(shù)學(xué)院;
【基金】：中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(12120115003301)~~
【分類號】：P618.13

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