Diagenesis systems and their spatio-temporal attributes in sedimentary basins
沉积盆地成岩作用系统及其时空属性

It is very important tor sedimentologists and petroleum engineers to understand sedimentary diagenesis of reservoirs in detail.However,so far we still can not know distribution and processes of diagenesis like that of sedimentation in basin-scale or macroscopic scale.Therefore,based on academic discussion on spatio-temporal attributes and master controls of diagenesis, a diagenesis system division framework is presented in the paper.Combined with ease studies of the Mesozoic-Cenozoic sedimentary basins in world as well as China,the authors state external attributes of diagenesis systems including basin scale,sequenee scale, sub-sequence scale and intrastratal scale and further explain their dynamic research thought and methods for both basin and sequence tracts.For basin scale,diagenesis distribution is dominantly controlled by tectonic unit,temperature-pressure field,provenance, climate controlling sedimentation,buried process and hydrographic regimes and their superposed style.For sequence scale,dominant controls on diagenesis distribution include buried process,sequenee structure,macroscopic physical-chemical barrier,depositional system distribution and hydrographic reghne.It is presented that hierarchical analysis of diagenesis systems is an important basis for understanding distinctive diagenetie texture among different basin types and,for definite sedimentary basins,spatio-temporal distribution of diagenesis can be well understood through basiowide hydrologic consideration and related fluid-rock interactions researches.Finally several key current tasks related to diagenesis systems are indicated and discussed:division of diagenesis systems and their boundary conditious;key mechanism in diagenesis system evolution,detailed structural evolution and temperature-pressure histories in basin-scale,exactly differentiating basin geofluid flow,numerical simulation and dynamic process of diagenesis in basin- scale.