本文選題：淺水三角洲 + 古地貌　； 參考：《地球科學(xué)》2017年11期

【摘要】：源-匯系統(tǒng)研究是當(dāng)今地質(zhì)學(xué)研究熱點(diǎn).東營凹陷南緩坡沙二段沉積時(shí)期是構(gòu)造穩(wěn)定的斜坡帶,與其物源區(qū)廣饒凸起構(gòu)成完整的源-匯系統(tǒng).基于巖心、測井、分析化驗(yàn)及三維地震資料,精細(xì)刻畫研究區(qū)古地貌形態(tài)及沉積物搬運(yùn)通道,明確沙二段淺水辮狀河三角洲沉積特征;通過地震屬性與鉆井巖性標(biāo)定,明確沉積體系分布及時(shí)空演化關(guān)系,探討沉積主控因素及源-匯體系配置關(guān)系.結(jié)果表明,物源區(qū)自西向東發(fā)育i~iii三個(gè)匯水單元,及V1~V4四個(gè)古溝谷,碎屑沉積物通過古溝谷搬運(yùn)輸送,向?yàn)I-淺湖沉積環(huán)境的緩坡(0.52°~1.29°)沉積區(qū)供源,形成平面上河道頻繁分叉改道、垂向上多個(gè)正韻律疊置、巖性以分選中等、磨圓較好的含礫砂巖為主的淺水辮狀河三角洲沉積.自沙二下亞段沉積期到沙二上亞段沉積期,沉積體向前推進(jìn),規(guī)模增大,沉積體系垂向演化主要受控于古氣候變化導(dǎo)致的湖平面升降.平面上,Ⅰ~Ⅲ沉積區(qū)內(nèi)朵葉體形態(tài)及規(guī)模受控于源區(qū)匯水單元面積、垂向高差及通道形態(tài)與規(guī)模,朵葉體面積與垂向高差及匯水單元面積呈正相關(guān).
[Abstract]:The study of source-sink system is a hot topic in geology. The sedimentary period of the second member of the south gentle slope of Dongying sag is a stable slope belt, which, with its provenance, Guangrao uplift, constitutes a complete source-sink system. Based on core, logging, analysis of laboratory data and 3D seismic data, the paleogeomorphology and sediment transport channels in the study area are described in detail, and the sedimentary characteristics of shallow water braided river delta in the second member of Shahejie are clarified, and the seismic attributes and drilling lithology are calibrated. The distribution of sedimentary system and the relationship between temporal and spatial evolution were clarified, and the main sedimentary control factors and the relationship between source and sink system configuration were discussed. The results show that from west to east, three catchment units of i~iii and four paleogranes of V1 / V4 are developed in the provenance region, and the detrital sediments are transported through the paleogrid valley and supplied to the gentle slope (0.52 擄/ 1.29 擄) of the shore-shallow lake sedimentary environment. The channel diverts frequently on the plane, and many positive rhythms are overlaid vertically. The lithology of the channel is composed of shallow water braided river deltas, which are mainly gravel-bearing sandstone with medium separation and good grinding. From the sedimentary period of the lower member of the second member to the sedimentary stage of the upper member of the second member, the sedimentary body advances forward and the scale increases. The vertical evolution of the sedimentary system is mainly controlled by the lake level fluctuation caused by the paleoclimate change. On the plane, the shape and scale of the flower leaf body in the 鈪，

本文編號：2052830