發(fā)布時(shí)間：2018-08-27 05:46

【摘要】：綜合利用巖心、測(cè)井及三維地震資料,應(yīng)用地震沉積學(xué)和地震地貌學(xué)方法,建立白云深水區(qū)晚漸新世三級(jí)層序地層格架,揭示白云凹陷東南部晚漸新世大型陸架邊緣三角洲的沉積結(jié)構(gòu)和沉積地貌特征。結(jié)果表明:珠海組至珠江組下段可劃分7個(gè)層序,中上部ZHSQ5、ZHSQ6和ZHJSQ1時(shí)期發(fā)育三期陸架邊緣三角洲沉積,其中ZHSQ5時(shí)期陸架邊緣三角洲發(fā)育范圍較小且相對(duì)富泥,前三角洲在地震剖面上呈約300m厚的斜交前積反射;ZHSQ6時(shí)期陸架邊緣三角洲展布最廣,前緣水下分流河道微相呈網(wǎng)狀交織,橫向展布達(dá)5km,三角洲前緣在地震剖面上為S型前積反射,前積體的高度向盆地方向逐漸減薄,前三角洲斜坡遠(yuǎn)端發(fā)育多個(gè)小型滑塌濁積體;ZHJSQ1時(shí)期繼承早期陸架邊緣三角洲的沉積特點(diǎn),同時(shí)前緣下斜坡伴生較大規(guī)模的滑塌濁積扇。估算三角洲沉積古水深為600m,三角洲前緣斜坡傾角為4°~7°,反映三角洲形成于深水陸架邊緣環(huán)境。晚漸新世相對(duì)海平面變化和沉積物供給共同作用控制研究區(qū)陸架邊緣三角洲的形成期次和展布規(guī)模,而同沉積斷裂活動(dòng)對(duì)陸架邊緣三角洲的發(fā)育位置及沉積形態(tài)具有制約作用。陸架邊緣三角洲前緣砂壩、分流河道砂體及前三角洲濁積砂體可構(gòu)成重要的油氣儲(chǔ)層。
[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(guó)地質(zhì)大學(xué)(北京)能源學(xué)院;中國(guó)海洋石油(中國(guó))有限公司深圳分公司;中國(guó)地質(zhì)大學(xué)(北京)海洋學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(91328201;91528301)
【分類(lèi)號(hào)】：P618.13

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