山东彭庄石炭二叠纪层序地层及聚煤特征

Sequence Stratigraphic and Characteristics of Carboniferous and Permian Coal Accumulation in Pengzhuang Area of Shandong Province

摘要:

国际二叠系三分后，随着鲁西南煤炭等资源进一步勘探要求，迫切需要厘清其地层特征以及其与聚煤特征的关系。经过岩心分析，结合钻井资料，运用层序地层学原理，以山东彭庄煤矿为例对石炭二叠纪地层进行层序地层研究，并对相应聚煤特征进行了分析。共识别出2个类型的层序界面，把该区石炭二叠纪地层划分为3个三级层序，S1相当于太原组上部，S2相当于山西组，S3相当于石盒子群下部。通过分析揭示S1主要为潟湖沼泽、潮坪相，物源相对较差。S2主要由下三角洲平原相中分流河道相、泥炭沼泽相、河口坝相组成，物源相对较丰富，在海侵初期开始产生聚煤作用，到末期煤层发育最好。S3主要为上三角洲平原相，无煤层发育。

Abstract:

Accompanying with dividing international Permian into three series, as the needs of further exploration of coal resource in southwestern Shandong province，the correlation between the internal stratigraphy characteristics and the characteristics of the coal accumulation should be defined. Through drilling cores analysis, combining with drilling data, by using the principle of the sequence stratigraphy, setting Pengzhuang coal mine in Shandong province as an example, Carboniferous and Permian sequence stratigraphy has been studied, and the characteristics of the coal accumulation have been analyzed. Two types sepuence boundries have been determined. Carboniferous and Permian strata in this area have been divided into three third-order sequences. S1 is equivalent to the upper part of Taiyuan formation, S2 is equivalent to Shanxi formation, and S3 is equivalent to the lower part of Shihezi group. S1 is mainly shallow lacustrine-swamp and tidal-flat facies with poor sources. S2 is mainly composed of stream channel facies, peat swamp facies, mouth bar facies in the lower delta plain facies with rich sources. The coal accumulation occurred mainly in the early transgression. It will be better in the last transgression. S3 is mainly the upper delta plain facies and no coal bed.