滦平盆地桑园营子露头剖面沉积层序的Markov链模拟

桑园营子露头剖面具有同沉积断层控制的近源、粗粒、陡坡型浅水扇三角洲体系的沉积特征。根据 Markov过程的基本原理 ,认识到桑园营子剖面出露完整的扇三角洲前缘沉积组合( C — C 旋回 )各岩性相之间的转移具有 Markov性质 ,利用转移概率矩阵法及差值矩阵法对该沉积组合进行 Markov链模拟 ,得出了理想的垂向沉积层序模式图。该模式图与实际地层层序吻合较好 ,反映了各岩性相的空间展布特征 ,建立了沉积环境的演化序列。

MARKOV CHAIN SIMULATION OF SEQUENCE ON SANGYUANYINGZI OUTCROP SECTION, THE LUANPING BASIN

Sangyuanyingzi outcrop section grows in a steepslope and shallow water lacustrine basin.The fan delta depositional system is controlled by the companion faults.The source areas are near,and the deposits are coarse grain.On the basis of the basic principle of the Markov procedure,the authors think that the transfers of the lithofacies of the C Ⅲ—C ⅩⅡ cycles have Markov qualities.Through applying the methods of the transfer frequency matrix and the difference matrix to simulate,the authors reach the ideal vertical depositional sequence model of the fan delta front associations (C Ⅲ—C ⅩⅡ cycles).The model is identical to the actual stratum sequence,reveals the spatial distribution characteristics of the lithofacies,and sets up the evolution sequences of the depositional environments.