何家集区上三叠统延长组长4＋5-长6油藏储集因素

Oil accumulation factors of Chang 4+5 and Chang 6 reservoirs of Upper Triassic Yanchang Formation in Hejiaji area

何家集区长4+5—长6油层组储层砂体累计厚度较大,粒度较细,沉积相变快,储层物性纵、横向具有明显的非均质性。影响石油富集成藏的储集因素包括岩石学组分、沉积相、砂体展布、成岩作用及物性等,其中沉积相是最主要的因素,三角洲平原分流河道砂体是主要的储集体。何家集区下一步勘探重点应在分流河道砂体带上寻找次生孔隙发育区。

The reservoirs of Chang 4＋5 and Chang 6 members in Hejiaji area are characterized by thick sand body, fine grain, faster change of sedimentary facies, and reservoir physical property has obvious heterogeneity in both the vertical and horizontal direction. Further research shows that reservoir factors that affect oil accumulation include petrological component, sedimentary facies, sand body distribution, diagenesis and physical property, etc., among which sedimentary facies is the most important one. Distributary channel sand bodies in deltaic plain are the main reservoirs. It is suggested that the next exploration should be in distributary channel sand bodies.