车镇凹陷层序地层学分析与隐蔽油气藏勘探

STRATIGRAPHIC SEQUENCE OF CHEZHEN DEPRESSION AND SUBTLE RESERVOIR EXPLORATION

济阳坳陷车57井在沙三段砂砾岩体获得了高产工业油流后,如何准确预测描述砂砾岩圈闭成为亟需攻克的勘探难题。为此,对济阳坳陷车镇凹陷下第三系进行了高精度层序地层的划分,建立了高精度层序地层等时格架;对层序地层单元不同体系域的砂体分布和成藏规律进行了研究,分析了不同构造岩相带成藏特点,建立不同构造带岩性油藏成藏模式,优选了勘探目标,取得了多个重要油气发现,其中埕914井获得日产100t的高产工业油流。

For Che 57 well of Chezhen depression, a highyield commercial oil has been obtained from the sandy conglomer-ate bodies of Sha 3 Member. How to accurately predict the sandy conglomerate trap becomes urgent. In this paper, the principle ofstratigraphic sequence is firstly applied to sedimentary research of terrestrial riftsubsidence lacustrine basin; and then the sequencestratigraphy is classified precisely for Lower Triassic of Chezhen depression, Jiyang Sag; the isochronai framework of sequence stratigra-phy with high accuracy is established; the sandbody distribution and reservoir-forming rule of different system tracts within stratigraph-ic sequence units are studied; the reservoir-forming characteristics of different lithofacies zones are also analyzod; the reservoir-forming model of lithological reservoir within different structural zones is developed; and the exploration prospect is optimized. As a re-suit, many important oil and gas discoveries have been obtained and a highyield commercial oil of 100t/d has been achieved forC914 well.