Research Idea and Practice of TectonicSequence Lithofacies Paleogeographic in Diverse Scales

Key words: 
• diverse scales

Abstract: Drawing paleogeography is an important method to reconstruct paleogeography of different geological history. Sedimentary sequence often manifests the cycle characteristic of different temporal and spatial distribution, which is coupled by the interaction of tectonic movement of diverse scale, global eustasy or base level cycle of different period or order, sedimentation and climate. Sedimentary sequence of different order and scale responds differently to varying driving mechanism. To link with hydrocarbon exploration closely, usually selecting the secondorder, thirdorder and mediumterm base level phases as compilation unit, to draw sequence lithofacies paleogeographic of small scale , medium scale and large scale on large plot , basin or large area inside basin, and important block. They are marked by the advantages, such as isochronisms, succession of the sedimentation process and practicability. The sequence lithofacies paleogeographic can manifest detailedly paleogeography in varying degrees and represent the combination and distribution regulation of material from diverse scale. And they can provide the theoretical and practical proofs for selecting exploration target area, predicting favorable zone and ascertaining reservoir, then provide service for every stage of hydrocarbon exploration. 