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三肇凹陷是一个平缓的负向二级构造单元,岩性变化大,油水关系复杂。尽管目前已基本完成详探工作,但对三肇凹陷油气聚集规律的认识,仍有许多不同的意见,归纳起来,一种意见认为是岩性油藏,另一种意见认为是构造油藏。笔者在研究了三肇凹陷沉积、构造特征及其与油气聚集关系的基础上,运用差异压实理论将沉积、构造、油气作为一个统一的石油地质体来分析。认为三肇凹陷油气聚集与沉积差异压实作用关系密切。压实的第二阶段(即塑性压实阶段)是微幅度构造形成和油气生成并进行初次运移的主要时期。在这一时期构造运动微弱,对三肇凹陷油气聚集不起主要作用。因此三肇凹陷是在差异压实作用下形成的自生自储、边生边储的岩性—构造组合油藏。
The Sanzhao depression is a gentle negative secondary tectonic unit with large changes in lithology and a complex relationship between oil and water. Although the detailed exploration work has been basically completed, there are still many different opinions on the understanding of the law of hydrocarbon accumulation in the Sanzhao depression. To sum up, one opinion is that it is a lithologic reservoir and the other is that it is a structural reservoir. Based on the study of the sedimentary and tectonic characteristics of the Sanzhao depression and their relationship with hydrocarbon accumulation, the author uses the differential compaction theory to analyze the sedimentary, tectonic and hydrocarbon as a unified petroleum geologic body. It is concluded that the hydrocarbon accumulation in Sanzhao depression is closely related to the differential compaction of sediments. The second stage of compaction (ie, the plastic compaction stage) is the main period of micro-amplitude tectonic formation and hydrocarbon generation and initial migration. During this period, tectonic movements were weak and did not play a major role in hydrocarbon accumulation in the Sanzhao depression. Therefore, the Sanzhao depression is a lithologic-structural assemblage reservoir formed by self-generation and marginal reservoir under differential compaction.