【摘要】：為了闡明白云凹陷古近系恩平組的物源供給方式及沉積充填演化規(guī)律,以古地貌-古生物分析、LA-ICPMS鋯石U-Pb定年、地震屬性分析及典型地震相識別為主要技術(shù)手段,對白云凹陷恩平組不同沉積時期的沉積環(huán)境、古地貌特征、鋯石形態(tài)及年代組成、砂體發(fā)育特征等進行分析,認為恩平組沉積時期其物源供給方式及沉積充填特征發(fā)生了明顯的變化.恩平組SQ1~SQ2時期陸相斷陷湖盆特征明顯,沉積時期沉積范圍較小,以盆內(nèi)短程物源(中生代火成巖基底母巖)供給為主:南部陡坡帶主要發(fā)育近源快速堆積而成的扇三角洲;北部緩坡帶發(fā)育充填結(jié)構(gòu)典型的辮狀河三角洲及上傾尖滅明顯的灘壩砂體.恩平組SQ3時期主要為半封閉的海灣沉積環(huán)境,沉積范圍較大,以盆外遠程物源(華南褶皺帶前寒武紀-古生代變質(zhì)巖基底母巖)供給為主:南部陡坡帶斷裂活動減弱,發(fā)育規(guī)模較小的扇三角洲;北部緩坡帶發(fā)育沿北西-南東方向展布的三期前積反射并不斷向盆地中心進積的典型大型辮狀河三角洲.
[Abstract]:In order to elucidate the source supply mode and sedimentary filling evolution law of the Enping formation of Paleogene in Baiyun depression, paleogeomorphology paleontology analysis, LA-ICPMS zircon U-Pb dating, seismic attribute analysis and typical earthquake recognition are the main technical means. The sedimentary environment, paleogeomorphology, zircon morphology and age composition, sand body development characteristics of the Enping formation in Baiyun depression are analyzed. It is considered that the material supply mode and the sedimentary filling characteristics of the Enping formation changed obviously during the sedimentary period. The characteristics of continental faulted lacustrine basin in the SQ1~SQ2 period of the Enping formation are obvious, and the sedimentary range is relatively small during the sedimentary period. The short-range provenance in the basin (the Mesozoic igneous basement parent rock) is mainly supplied. The fan delta formed by the rapid accumulation of the near source is mainly developed in the southern steep slope zone. The braided river delta with typical filling structure and the beach bar sand body with obvious updip tip are developed in the north gentle slope zone. The SQ3 period of the Enping formation is mainly a semi-enclosed bay sedimentary environment, with a large sedimentary range, mainly supplied by remote outbasin provenance (Precambrian-Paleozoic metamorphic basement parent rock) in the South China fold belt, and the fault activity of the southern steep slope belt is weakened. Developing a small fan delta; A typical large braided river delta is developed in the northern gentle slope zone, which is distributed in the north-west to the southeast direction of the basin and is reflected in three stages of progradation and continuously precession to the center of the basin.
【作者單位】： 中國地質(zhì)大學構(gòu)造與油氣資源教育部重點實驗室;中國地質(zhì)大學資源學院;中海油研究總院;
【基金】：國家科技重大油氣專項(Nos.2011ZX05023-001-015,2011ZX05023-001-001)
【分類號】：P618.13

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