The Correlation & the Connectivity Types of Sandbody In the Process of Oilfield Geological Study

In the process of oilfield development geological study,the correlation relationship and connectivity of the sandbody could be scertained by single oil layer correlation method.that based oncycle correlation,step control and distinctive treatment for different facies belt Because of great changes on the continuity and thickness stability of sandbody,it is difficult to show true features of sandbody by simple methods.It is according to make different correlation model by changes of sedimentary microfacies.The paper describes for methods of multi-inter-well correlation and sandbody connectivity on the basis of sedimentary microfacies and sandbody genesis relationship.(1)The distribution of the single fluvial sandbody is characterized by lateral changes quickly,especially thickness of sandbody,and presence of multi-microfacies pattern,thereby forming a variety of connected relationship of sand body.There are three main correlation patterns for connected relationship that include are concerned by which are stacking pattern of multi-periods fluvial sandbody,sandbody facies-change and single incised channel body.(2)It is complex type.for the connected relationship of delta front facies sandbody.It is the key of correlation for delta to correctly determine the relationship of isochronous surface and iso-lithology surface,and It can be considered as the correlation method of isochronous surface and iso-lithology surface for the delta sedimentary facies.Oil layer connectivity and injection-production relationship,single side up horizontal sandstone layer connectivity,depends largely on well spacing density and single sand body.Which drilled the single sandbody.