發(fā)布時(shí)間：2018-05-28 00:48

  本文選題：陸相湖盆 + 三角洲��； 參考：《古地理學(xué)報(bào)》2016年04期

【摘要】：陸相湖盆與海洋環(huán)境不同,具有水體淺、能量弱、湖進(jìn)湖退頻繁等特點(diǎn)。綜合應(yīng)用高精度層序地層學(xué)和地震沉積學(xué)等關(guān)鍵技術(shù),通過中國東部及中西部典型陸相湖盆的勘探實(shí)踐、野外露頭解剖和現(xiàn)代沉積考察,總結(jié)了陸相湖盆三角洲—灘壩復(fù)合砂體的分布模式,并提出了復(fù)合砂體地質(zhì)編圖法。研究結(jié)果表明:(1)陸相湖盆的"湖—陸過渡沉積體系"不僅發(fā)育分流河道,還發(fā)育河口壩和沿岸砂壩,這些不同時(shí)期的分流河道、河口壩和沿岸砂壩交織疊加在一起,在古代地層和現(xiàn)代沉積中得以保存;(2)地形平坦處,水體淺、波浪作用不強(qiáng)、河流作用為主,形成河道砂體;湖岸較陡處,波浪作用強(qiáng),分流河道砂體被波浪改造,形成沿湖岸分布的灘壩砂體;(3)在高頻湖平面變化背景下,岸線的遷移導(dǎo)致沉積坡折的遷移,形成了多期垂直于岸線分布的樹枝狀三角洲分流河道砂體,和多期平行于岸線呈帶狀分布的沿岸灘壩砂體相互交織的陸相湖盆三角洲—灘壩復(fù)合砂體的特殊結(jié)構(gòu);(4)復(fù)合砂體地質(zhì)編圖法基于傳統(tǒng)單因素法,以復(fù)合砂體分布模式為指導(dǎo),主要針對(duì)發(fā)育在水體較淺、地形平坦開闊背景下的陸相湖盆三角洲—灘壩砂體。
[Abstract]:The continental lacustrine basin is different from the marine environment and has the characteristics of shallow water, weak energy and frequent lake entry and retreat. Based on the exploration practice of typical continental lacustrine basins in eastern and western China, the field outcrop anatomy and modern sedimentary investigation are carried out through the application of key techniques such as high-precision sequence stratigraphy and seismic sedimentology. In this paper, the distribution model of the delta-beach bar composite sand body in continental lacustrine basin is summarized, and the geological mapping method of the composite sand body is put forward. The results show that the "lake-land transitional sedimentary system" in the continental lacustrine basin not only develops distributary channels, but also develops estuarine dams and coastal sandbars. These distributary channels, estuaries and coastal sandbars are intertwined and superimposed in different periods. In ancient strata and modern sediments, the topography is flat, the water body is shallow, the action of wave is not strong, the action of river is dominant, the sand body of river is formed, and the sand body of distributary channel is transformed by wave in the steeper part of lake bank, and the sand body of distributary channel is transformed by wave. In the background of high frequency lake level change, the migration of shoreline leads to the migration of sedimentary slope break, forming dendritic delta distributary channel sand body perpendicular to shoreline for many periods. The geological mapping method is based on the traditional single factor method and guided by the distribution model of the composite sand body, and the special structure of the continental lacustrine lake basin delta-beach dam composite sand body intertwined in many periods parallel to the shoreline with a zonal distribution of the beach dam sand body, is based on the traditional single factor method, and is guided by the distribution model of the composite sand body. It is mainly aimed at the delta-beach bar sand body of continental lacustrine basin with shallow water and flat and open terrain.
【作者單位】： 中國石油大學(xué)(北京)地球科學(xué)學(xué)院;中國石油大學(xué)(北京)油氣資源與探測(cè)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(編號(hào):41272157) 中國石油科技創(chuàng)新基金項(xiàng)目(編號(hào):2014D-5006-0101) 中國石油大學(xué)(北京)科研基金項(xiàng)目(編號(hào):2462013YJRC038;2462015YQ0108) 國家科技重大專項(xiàng)(編號(hào):2011ZX05003-002)聯(lián)合資助~~
【分類號(hào)】：P512.2

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