TYPES OF CENO-MESOZOIC PETROLIFEROUS BASINS IN EASTERN CHINA, AND ITS RELATIONSHIP WITH OIL AND GAS--BASED ON THE COMPACTION OF MUDSTONE
-
摘要: 沉积盆地的沉积物,随着自身的加厚和深埋,上覆负荷的增加和地温的升高,沉积物必将发生压实作用和固结作用。在这种成岩作用下,沉积物中的岩石矿物类型、岩石密度、孔隙度和渗透率等也将发生一系列的物理化学变化。本文主要根据泥岩压实及有关资料探讨盆地或坳(凹)陷的有关机制、类型和油气关系。Abstract: Based on a large number of data of the measured porosity of mudstone, the acoustic logging, and the X-ray diffraction analysis of clay minerials, the types of Ceno-Mesozoic basins, i.e. Sanshui, Miyang, Huanghua, in eastern China, and its relationships with oil and gas are studied. The authors proposed. 1. The compaction curve of mudstone can be used to estimate the denudation and calculate the depths of denudation of a basin or depression. The study shows that the degree of the denudation of the Ceno-Mesozoic basins in eastern China is decreased gradually from south to north. 2. According to the depths of denudation calculated by the compaction curve of mudstone, the Ceno-Mesozoic basins in eastern China can be divided into seriously denuded Sanshui compaction type and slightly denuded Huanghua compaction type. These two types correspond with the two sub-types, from the plate tectonic view point, i. e. the fault-down basin developed on the basis of large-scale of depression fold; and the fault-down basin developed on the basis of large scale of uplift fold, which were formed under extension in eastern China. 3. As to the serious denudation basins,the maximum buried depth of the strata must be restored and the history of oil-generation must be reestabli-shed according to the depth of denudation. 4. In the light of the mixed compaction zone of mudstone and montmori llonite-illite mixed layer zone of clay minerals, the favourable zone of hydrocarbon expulsion of a basin or depression can be defined. Together with the buried history of the basin or depression, the period of the primary migration of oil and gas can then be inferred.
-
[1] 真柄钦次著, 陈荷立等译, 压实与流体运动, 石油工业出版社, 1981年. [2] Magara, K., 1979, Thickness of Removed Sediments,Paleopore pressure, and Paleotemparature, Southwestern Part of Western Canada Basin Bull,AAPG, Vol.60, P.554-565. [3] 东发景等, 我国东部中新生代盆地生油岩、煤、蒸发岩的分布及其控制因素, 地球科学, 1982年第一期. [4] 陈发景等, 我国东部白垩纪-早第三纪蒸发岩和生油岩沉积的区域构造背景, 石油与天然气地质, 第4卷第2期, 1983年. [5] 陈焕疆, 中国油气盆地的构造体制和控油关系, 石油地质论文集——区域评价, 地质出版社, 1981年. [6] 何炳骏, 华北地区地层压实作用与油气初次运移, 石油学报, 增刊, 1981年. [7] 孙永福, 上海地区第四系工程地质性质与分区, 上海地质, 1980年第1期. [8] 田克勤等, 黄骅坳陷油气生成与初次运移的探讨, 石油学报, 等二卷第一期, 1981年.
点击查看大图
计量
- 文章访问数: 411
- HTML全文浏览量: 30
- PDF下载量: 288
- 被引次数: 0