【作者】 杨文斌；

【导师】 肖建新； 李占山；

【作者基本信息】 中国地质大学（北京） ， 地质工程， 2011， 硕士

【摘要】 勃利盆地是黑龙江省东部最大的中生代断陷盆地。盆地北侧为剥蚀边界,西南为依兰～勃利断裂,南侧为兴农～兴凯断裂,东南侧为裴德断裂。盆地内断层很发育,地质构造非常复杂。勃利盆地地处的黑龙江省东部是我国东北中生代唯一具有海相沉积的地区,沉积相类型复杂而齐全,海相、陆相、过渡相频繁交替,独具特色。勃利盆地的发展总体可分为裂陷初始期、裂陷扩大期、扩张沉降期、拗陷萎缩期四期。勃利盆地的煤系地层包括鸡西群和龙爪沟群,以含煤地层厚度大、分布广、含煤层数多、煤种齐全为主要特征。鸡西群分布于西部桦南拗陷和中部七台河拗陷内,龙爪沟群主要分布于宝密拗陷内。各岩组均含煤,但以城子河组含煤性最好。勃利盆地在黑龙江省东部诸盆地中,具有沉降时间早、沉积厚度大、海侵次数多、海侵范围广、火山活动强烈等特点。盆地沉积演化受构造演化控制明显。勃利盆地基底由元古界、上古生界、上三叠统以及元古代~印支期花岗岩共同组成。充填在盆地内的地层主要有下白垩统龙爪沟群和鸡西群、下白垩统桦山群、上白垩统、第三系及第四系。盆地南部下白垩统较发育,北部缺失七虎林组,东部缺失穆棱组。勃利盆地各组地层的厚度、几何形态、堆积性质和相互关系所构成的地层格架,显示了断陷—拗陷型盆地的沉积充填特点。沉积地层厚度总体上具有东厚西薄、南厚北薄的特点。勃利盆地的煤层聚集是在近海区。海平面升降形成海侵-海退沉积旋回,控制煤系地层的沉积,形成海陆交替相沉积聚煤层序。盆地充填序列为滴道组(海侵期)、城子河组(海退期),为内陆平原和滨海平原聚煤,形成大型聚煤盆地。穆棱组为内陆盆地陆源碎屑沉积。勃利断陷盆地内,聚煤带和富煤中心是受盆内次级同生隆起和凹陷控制,因此勃利断陷盆地内在同一时期并不是整个盆地全部聚煤,而仅在盆地某一部位聚煤,而聚煤带内尚有富煤中心与贫煤区的分别,因此从全盆地角度讲,勃利盆地的煤层都是局部可采煤层。更多还原

【Abstract】 Boli Basin, in the east of Heilongjiang Province, is the largest fault basin in mesozoic. The denudation boundary located in north of the basin, the Yilan ~ Boli fracture in the southwest, the Xingnong~ Xingkai fracture in the south and the Feide fracture in the southeast. The faults in the basin are very developed and geological structures are complicated.Located in the eastern of Heilongjiang Province in Northeast China, Boli Basin is the unique area contained the marine sedimentary in Mesozoic. Complex and complete sedimentary facies--marine, continental and transitional were frequently alternating. Boli Basin’s development can be divided into four stages: early chasmic stage, expansion chasmic stage, expansion sedimentary stage and depression dwindling stage.Coal measure strata of Boli Basin include Jixi group and Longzhaogou group. The coal-bearing strata’s main features are large thickness, wide distribution, multiple coal seams and complete coal type. Jixi group located in western Huanan depression and central Qitaihe depression. Longzhaogou group mainly located in Baomi depression. All of petrofabric contains coal, but the best is Chengzihe formation.It is the characteristics of Boli Basin in the eastern part of Heilongjiang Province’s various basins that settlement earlier and sediment thickness, multi-transgression, transgressive wide range, intense volcanic activity ect. Sedimentary basin evolution is obviously controlled by the tectonic evolution.Boli basin basement is constituted by Proterozoic, together with upper Paleozoic, upper Triassic and Indo-Proterozoic granite. The major strata filling in the basin are Longzhaogou Group and Jixi group of Lower Cretaceous, Hua shan group of Cretaceous, Upper Cretaceous, Tertiary and Quaternary. Lower Cretaceous in the southern Basin is developed, but the northern missing seven Hulin formation and eastern missing Muling formation.The stratigraphic framework which is made up of thickness, and geometry, accumulation of the nature, relationship in Boli Basin shows faulted-depressed basin sedimentary filling characteristics. Overall thickness features of sedimentary strata in the east, south are thicker than north and west.Belts of coal bed accumulated in Boli Basin are offshore water. The regressive~ transgressive sedimentary cycle that formed by sea level uplift and sag controled deposition of coal seams, formed poly sea coal deposits alternating sequence. Basin-fill sequence is Didao (transgression period), Chengzihe (regression period) that contained coal from the interior plains and coastal plains, formed a large coal basin. Muling formation is clastic deposition form inland basin.In Boli Faulted Basin coal-accumulating belt and rich coal center is affected by basin in subprime homozygous uplift and sag control. So in the same period it is not the whole basin all coal-accumulating, but only in a part basin coal-accumulating. Coal-accumulating belt have coal center difference with the poverty. Therefore, from the perspective of the whole basin Boli Basin coal seam layers are locally.更多还原