【摘要】：為了闡明二連盆地洪浩爾舒特凹陷重點區(qū)塊沉積砂體分布特征以及更好地指導油氣精細勘探,在層序地層學和現(xiàn)代沉積學理論指導下,依據(jù)地震反射終止關系、巖性、沉積構(gòu)造及其序列以及測井相特征,將二連盆地洪浩爾舒特凹陷白堊系阿爾善組劃分為包含低位、湖侵及高位體系域的一個完整三級層序。高位體系域主力產(chǎn)油層段可劃分為3個準層序組(砂組)和10個準層序(小層),且每個小層均發(fā)育了近岸水下扇和辮狀河三角洲。近岸水下扇巖性為塊狀砂礫巖,發(fā)育塊狀和遞變層理、疊覆沖刷,與暗色泥巖伴生構(gòu)成間斷正韻律;辮狀河三角洲巖性為發(fā)育中型、大型楔狀交錯層理及沖刷面的砂巖,呈間斷正韻律。隨著湖平面升降,近岸水下扇和辮狀河三角洲發(fā)生進積和退積,其中阿爾善組Ⅱ砂組沉積時期物源供給充足,形成規(guī)模較大的砂體,因此Ⅱ砂組可作為洪10區(qū)塊阿爾善組的重點勘探層段。
[Abstract]:In order to elucidate the distribution characteristics of sedimentary sand bodies in key blocks of Honghao'ershute depression in Erlian Basin and better guide oil and gas fine exploration, under the guidance of sequence stratigraphy and modern sedimentology theory, according to the termination relation of seismic reflection, lithology is obtained. Sedimentary structures, their sequences and logging facies are used to divide the Cretaceous Alshan formation in Honghao'ershute depression, Erlian Basin, into a complete third-order sequence containing the lowstand, lacustrine transgressive and highstand system tracts. The main oil-producing strata in the high system tract can be divided into 3 quasi sequence groups (sand formation) and 10 quasi sequences (small layers), each of which has developed nearshore underwater fan and braided river delta. The nearshore underwater fan lithology is a massive sand-gravel rock with block and progressive bedding, overlying and scouring, and accompanies with dark mudstone to form a discontinuous regular rhythm, and the braided river delta lithology is a medium developed sandstone with large wedge-shaped interlaced bedding and scour surface. A discontinuous positive rhythm. With the rise and fall of the lake level, progradation and retrogradation occur in the nearshore underwater fan and braided river delta. During the deposition period of the second sand formation of the Alshan formation, there is a sufficient supply of provenance, resulting in the formation of a large scale sand body. Therefore, sand formation 鈪，

本文編號：2254454