延长油田石油地质特征

The Petroleum Geology Characteristics of the Yanchang Oil Field

延长油田勘探开发目的层为三叠系延长组长6油层组,储层已进入晚成岩作用阶段,具有矿物成熟度低、结构成熟度高、成岩作用强烈的特点。储层为低孔隙度、特-超低渗透率致密砂岩,浊沸石微溶型储层是本区的主要储层类型,粒间孔-溶孔型孔隙组合为主要孔隙空间类型,次生孔隙有效地改善了储层物性,是重要的储集空间。三角洲前缘水下分流河道砂体是本油田的主要储集层段。石油地质特征表现为沉积微相控制储层岩性,岩性和成岩作用控制物性,物性控制含油性,缺乏局部构造,为典型的岩性油藏。

Chang 6oil formation of Triassic system Yanchang formation is target strata of exploration and development in the Yanchang oil field;reservoirs get into late diagenesis;there are the characters of the lower mineral maturity,high stuctrue maturity and violent diagenesis.Reservoirs in the chang 6oil formation belong to the reservoirs of low porosity and especially low-superly low permeability.Resevoirs of the micro solution about laumontite are the main reservoir type;main pore types are composed of the intergranular pores and intergranular dissolved pores.Secondary pores are the important reservoir space and improve reservoir physical property.The main reservoirs of oil field are the distributary channel sand bodies.Features of petroleum geology in the Basin are as follows：Sedimentary microfacies control reservoir lithology;lithology and diagenesis control property;property controls local structure.So Yanchang oil field is representative lithologic oil pools.