Study On Diagenesis In Different Deformation Structure Area Of Mesozoic In Jiangsu And Anhui Region

Mesozoic is the period of active tectonic movements and transitional period of from Marine sediments to the continental sedimentary in Lower Yangtze region. Researching the diagenesis in different deformation structure area of mesozoic in suwan lower Yangtze region has important theoretical and practical significance to reveal geology discipline and guide exploration and development of oil-gas field.This paper begins from field reconnaissance and Rock sampling,Using the test analysis technology including ordinary optical microscope,Scanning Electron Microscopy,EDS,X-ray diffraction and Inclusion analysis,Summarizing the diagenesis type of Qinglong formation and Xiangshan formation,the feature of diagenesis of compressive stress field and tensile stress field in different deformation structure area.,discussing the diagenesis controlled by tectonic deformation,fold and rupture.On this basis, establishing the grading standards of diagenetic intensity, dividing the block of diagenetic intensity in Qinglong formation and Xiangshan formation of the studying area.According to the researching result, several achievements have been obtained as follows.(1)Reconnoitering the main outcrops of Triassic Qinglong and Jurassic Xiangshan formation in Lower Yangtze region,mastering the sedimentary characteristics and tectonic characteristics of objective formation.(2)Summarizing the diagenetic type of Triassic Qinglong and Jurassic Xiangshan formation of the studying area.,discussing the feature of diagenesis of compressive stress field and tensile stress field in different deformation structure area.(3)Discussing the feature of diagenesis controlled by tectonic deformation,Though the analysis of diagenetic differences in folds whose deformation extent is different and in the different part of the fold and the influence of fracture,we confirm that there is correlation between diagenesis and tectonic deformation: the more complex tectonic deformation is, the more abundant the type of diagenesis is and the diagenetic intensity is stronger.(4)Establishing the grading standards of diagenetic intensity of Triassic Qinglong and Jurassic Xiangshan formation of the studying area,dividing the Qinglong formation into three kinds of diagenetic intensity block,that is strong, middle and weak, dividing the Xiangshan formation into two kinds of diagenetic intensity block,that is middle and weak,and dividing the studying area into three kinds of diagenetic intensity block,that is strong, middle and weak.