CAJ | 학술논문

汤原断陷新安村组-达连河组中广泛发育扇三角洲沉积.根据岩心观察、测井和地震资料分析、岩性鉴定、粒度分析等资料,识别出扇三角洲平原、扇三角洲前缘、前扇三角洲3个亚相,并进一步识别出8个微相.从扇三角洲平原到扇三角洲前缘,不同沉积微相的沉积特征呈现规律性的变化:沉积物结构如支撑关系由杂基支撑到颗粒支撑,颗粒间由点接触变为面接触,颗粒分选由差到好,成熟度由低到高,沉积物的粒度由粗变细等;沉积层理构造由扇三角洲平原砂砾混杂的块状层理到前缘小型低角度的交错层理、波状层理等;概率累计曲线由扇三角洲平原的一段式、低角度两段式到扇三角洲前缘的斜率较大的二段式、三段式;在C-M图上,扇三角洲平原的点群多在C、M值较大的PQ段,前缘多在OR、RS段.在此基础上,结合岩心特征、粒度分析等资料得出扇三角洲的水动力机制主要为牵引流沉积,少量重力流沉积.
탕원단함신안촌조-체련하조중엄범발육선삼각주침적.근거암심관찰、측정화지진자료분석、암성감정、립도분석등자료,식별출선삼각주평원、선삼각주전연、전선삼각주3개아상,병진일보식별출8개미상.종선삼각주평원도선삼각주전연,불동침적미상적침적특정정현규률성적변화:침적물결구여지탱관계유잡기지탱도과립지탱,과립간유점접촉변위면접촉,과립분선유차도호,성숙도유저도고,침적물적립도유조변세등;침적층리구조유선삼각주평원사력혼잡적괴상층리도전연소형저각도적교착층리、파상층리등;개솔루계곡선유선삼각주평원적일단식、저각도량단식도선삼각주전연적사솔교대적이단식、삼단식;재C-M도상,선삼각주평원적점군다재C、M치교대적PQ단,전연다재OR、RS단.재차기출상,결합암심특정、립도분석등자료득출선삼각주적수동력궤제주요위견인류침적,소량중력류침적.
Fan deltas are widely developed in Xin'ancun and Dalianhe Formation of Tangyuan fault depression. According to core observation, well logging, seismic, lithology identification and grain size analysis, three subfacies including fan-delta plain, fan-delta front and pro-fan delta and eight microfacies are identified. From fan-delta plain to fan-delta front, the sedimentary characteristics of different microfacies changes regularly. The sediment textures such as the supporting type change from matrix-support to grain-support, the contact relationships between grains change from points to surfaces, grain separation from bad to good, the maturity from low to high, and the size of sediments from coarse to fine. The sedimentary bedding structures are massive bedding being miscellaneous in gravels that developed in fan-delta plain, and small-scale cross bedding with low angle and wave bedding developed in fan-delta front. The cumulative relative frequency curves are one-step and two-step type with low angle in fan-delta plain, but are two-step with steep slope and three-step type in fan-delta front. In the C-M diagram, the point group of fan-delta plain mostly concentrates in PQ section with large C and M value, and fan-delta front mainly concentrates in QR and RS section. Based on these studies, and combined with core characteristics and grain size analysis, it can be concluded that hydrodynamic mechanism of fan delta in this area is mainly traction current deposit, but gravity flow also plays some action.