济阳坳陷车西洼陷漫湖洪水—风暴沉积与砂体横向预测

渐新统沙二段是济阳坳陷车西地区的主力油层,为了弄清其油气分布和控制因素,综合利用大量的地质和地球物理资料,首次在该段识别出漫湖洪水—风暴重力流沉积.该沉积具有明显的重力流沉积特征,砂岩的成分和结构成熟度均较低,粒度概率图多由悬浮次总体组成,沉积序列可用Bouma序列来描述.在明确了砂体的沉积层位和沉积边界的基础上,描述了漫湖洪水—风暴的沉积特征并建立了沉积模式,系统分析了这个环境下储集性砂体的分布及其油气聚集特征,为车西洼陷的进一步勘探指明了方向.

Flood-storm deposit of Chexi area in Jiyang Depression and determination of the boundary of its sandbodies

The second member of Shahejie Formation is major reservoir of Chexi area, and in order to understand the oil & gas distribution in this area and its controlling factors, the flood - storm deposit is first identified in Chexi area by making use of a lot of geological and geophysical data. The deposit has the obvious features of gravity flow. Its sandstone is of low maturity of composition and texture and of high content of suspended substance in grain-size probability diagram. Its depositional sequence can be described by Bouna sequence. On the basis of the determination of the horizon and the boundary of its sandbodies, the depositional features of the flood - storm deposit are described, and the sedimentation model of it is established. Then, the distribution and the hydrocarbon accumulating feature of the sandbodies are systematically analyzed, which can provide guidance for the further exploration of Chexi area.