松辽盆地扶新隆起带南部扶余油层沉积特征及沉积模式探讨
摘要: 利用18口井的岩芯分析资料、1 595个重矿物分析数据和近800口井的录井、测井等资料,系统分析了扶新隆起带南部扶余油层的沉积特征和沉积模式。研究揭示扶新隆起带南部扶余油层沉积时期受西南保康物源体系和东南部长春—怀德物源体系双重控制,形成了枝状的高能河控三角洲沉积体系。该三角洲体系骨架砂体为大量、密集、窄带状、连续分布的分流河道砂体,总体呈南南西向展布,砂体连续且向水下延伸较远,直至消失变成薄的席状砂,在三角洲分流平原和三角洲前缘亚相区,形成以(水下)分流河道沉积为中心的多支“河控带状体”;前三角洲亚相与三角洲前缘亚相无明显界限,受湖浪作用控制在三角洲前缘亚相的外前缘区形成浪控席状砂,多个席状砂呈顺岸、垂源平行排列,单一席状砂具有明显条带、环状平面分布模式。
Study on Depositional Characteristics and Model of Fuyu Oil Layer in the Southern Fuxin Uplift of Songliao Basin
Abstract: It is the most important area of exploration in the southern Fuxin uplift of Songliao Basin in recent years, and its major oil producing zone is Fuyu oil layer in the 4th Member, Quantou Formation. Currently, it is still large differences on depositional system and sedimentary facies and depositional characteristics in understanding of Fuyu oil layer, and understanding of the differences restricted the pace of exploration and development of oil and gas. Therefore, it is urgently needed to study on depositional characteristics and model. It can be the next steps for this area to provide the basis for exploration and development of oil and gas.Based on 18 well cores , 1595 heavy mineral data and logging data of nearly 800 well, depositional characteristics and models of Fuyu oil layer in the southern Fuxin uplift was analyzed. It is realized that the southern Fuxin uplift is a intersections area of the two sources, the southwest Baokang and the southeast ChangchunHaide in the period of Fuyu oil layer. Ⅰarea and Ⅲ area are controlled by the southwest Baokang Sources. Ⅱarea and Ⅳ area are mainly controlled by the two sources, the southwest Baokang and the southeast ChangchunHaide. Branched highenergy shallow lacustrine fluvialdominated delta of Fuyu oil layer in the southern Fuxin uplift are mainly controlled by the two sources, the southwest Baokang and the southeast ChangchunHaide. As SSW distribution submerged distributary channel sandbodies as sand body framework of this delta system is abundant, closely and narrow. It is continual than original understanding and it extends to the far underwater, until disappearing into thin sheet sands. And many fluvialdominated bandings are formed. Based on understanding of sedimentary background and depositional characteristics and sedimentary facies types of Fuyu oil layer in the southern Fuxin uplift, depositional model of "double source" shallow lacustrine fluvialdominated delta is established: (1) Continental restrictive distributary channel is the center of the delta distributary plain subfacies. and fluvialdominated banding is formed, which is planar sedimentary microfacies sequences of distributary channel→levees→crevasse splay, overbank sand→interdistributary estuary. (2) Underwater distributary channels are main in the delta front. and fluvialdominated banding is formed, which is planar sedimentary microfacies sequences of underwater distributary channel→sheet sand→inner margin of sheet sand→outer margin of sheet sand→underwater interdistributary. (3) It is no significant demarcation between delta front and predelta. tidedominated sheet sand was formed in the shallow lacustrine fluvialdominated delta outer front, which is mainly controlled by wave in lakes. Multiple sheet sands show parallel venation of vertical sources. Single sheet sand is banding and ringlike planar distributing model of sheet sand→inner margin of sheet sand→outer margin of sheet sand→underwater interdistributary from central to around.
松辽盆地扶新隆起带南部扶余油层沉积特征及沉积模式探讨[J]. 沉积学报, 2012, 30(4): 706-715.
引用本文: |
松辽盆地扶新隆起带南部扶余油层沉积特征及沉积模式探讨[J]. 沉积学报, 2012, 30(4): 706-715.
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Study on Depositional Characteristics and Model of Fuyu Oil Layer in the Southern Fuxin Uplift of Songliao Basin[J]. Acta Sedimentologica Sinica, 2012, 30(4): 706-715.
Citation: |
Study on Depositional Characteristics and Model of Fuyu Oil Layer in the Southern Fuxin Uplift of Songliao Basin[J]. Acta Sedimentologica Sinica, 2012, 30(4): 706-715.
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