白云凹陷東南部晚漸新世陸架邊緣三角洲沉積特征及沉積地貌演化
[Abstract]:The third order sequence stratigraphic framework of late Oligocene in the Baiyun deep water area was established by using the core, logging and 3D seismic data, using seismic sedimentology and seismic geomorphology. The sedimentary structure and sedimentary geomorphology of the deltas of the large continental shelf of late Oligocene in the southeast of Baiyun depression are revealed. The results show that the lower member of the Zhuhai formation to the Pearl River formation can be divided into 7 sequences. In the middle and upper parts of the ZHSQ5,ZHSQ6 and ZHJSQ1 periods, the three stages of continental shelf margin delta deposits are developed, and the ZHSQ5 period has a relatively small range of continental shelf margin deltas and is relatively rich in mud. The front delta is about 300 m thick oblique forward product reflection. In ZHSQ6 period, the continental shelf margin delta spread most widely, and the front underwater distributary channel microfacies interweaved in the shape of network, and the transverse distribution reached 5 km. The delta front was S-type proaccumulative reflection on the seismic profile. The height of the protects is gradually thinning towards the basin, and several small sloughed turbidite bodies developed at the far end of the front delta slope in ZHJSQ1 period inherited the sedimentary characteristics of the early continental shelf margin delta, and accompanied by a large scale sloughing turbidite fan on the lower slope of the front edge. It is estimated that the paleo-water depth of the delta is 600 m, and the slope inclination of the delta front is 4 擄/ 7 擄, which indicates that the delta was formed in the edge environment of the deep-water shelf. The late Oligocene relative sea level change and sediment supply control the formation stage and distribution of marginal deltas in the study area, while synsedimentary fault activity restricts the development position and sedimentary morphology of continental shelf marginal deltas. The delta front bar, distributary channel sand body and pre delta turbidite sand body on continental shelf edge can form important oil and gas reservoir.
【作者單位】: 中國地質大學(北京)能源學院;中國海洋石油(中國)有限公司深圳分公司;中國地質大學(北京)海洋學院;
【基金】:國家自然科學基金項目(91328201;91528301)
【分類號】:P618.13
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