轮南地区三叠系辫状河三角洲沉积储层特征

轮南地区三叠系储层分布广泛，对砂体展布及储层特征的详细研究对该区的精细勘探具有指导意义。在层序格架基础上，应用露头、测井、录井资料，分析三叠系的岩性、结构、构造特征及储层物性特征，总结该区三叠系的沉积特征及储层特征。该区三叠系为冲积扇—辫状河三角洲-湖泊沉积体系，自北向南依次展布，沉积主体为辫状河三角洲平原、辫状河三角洲前缘亚相沉积及滨浅湖沉积。储集砂体主要为分流河道及水下分流河道沉积，储集空间为粒间孔、粒间溶孔，储层孔渗性好。平面上物性自北向南逐渐变好；垂向上向上物性变差。轮南地区三叠系储层发育，油气藏形成的主控因素为圈闭及油源条件。

Sedimentary Characteristic and Physical Property of Braid Delta of Triassic in Lunnan Region

There is wide distribution of Triassic formations in Lunnan area,the detailed research of the distribution of sand bodies and the characteristics of the reservoirs will be valuable to fine exploration in the area.On the basis of sequence frame,by means of the such data as outcrops,well logging and log,the lithology,texture and structure of Triassic formations and the physical property of the reservoirs are analyzed,the characteristics of deposition and reservoirs of Triassic formation in the area are summarized.The sedimentary system in Triassic formations in the area is alluvial fan-braided river daltalacustrine system,distributing from south to north,the main sedimentary bodies are braided river delta plain,braided river delta front margin,lakeside and shallow lacustrine ones.Reservoir sand bodies are dominated by branched alluvial channel and under water branched alluvial channel deposition.Pores are dissolved inter-particle and intra-particle ones,reservoirs are of good porosity and permeability.On plain,the physical property gets better southwards from north,vertically,the property gets worse upwards.In the area,reservoirs in the formations develop well,the key factors for reservoir to form are the conditions of trapping and hydrocarbon source.