塔河1区三叠系储层中夹层特征及识别

THE CHARACTERISTICS AND IDENTIFICATION OF THE RESERVOIR INTERCALATION OF TRIASSIC IN TAHE 1 AREA

对于底水油藏而言,分布于油水界面以上的夹层,对开发中的底水水侵有一定阻碍作用。因此,在底水油藏的控制水侵地质条件的评价中,对夹层的类型和厚度及分布研究十分重要。这里综合利用测井、岩心等资料,对塔河1区三叠系下油组油藏中发育夹层类型及特征进行研究。结果表明,研究区内夹层可分为灰质砂岩夹层、泥质夹层和物性夹层三类。在纵向上,夹层普遍分布在韵律层顶部和油水界面附近;在平面上,各类夹层普遍发育在1区构造高部位,泥质夹层和物性夹层往往可连成片状分布。该区夹层发育部位生产井见水时间相对较长,且含水上升速度较慢,这说明夹层发育区对开发过程中油藏底水锥(直井)进和脊进(水平井)起到了一定的阻碍作用。

For the bottom water reservoir, the intercalation distributing upon the oil -water interface has certain hinder to the development of aggression of the bottom water. Therefore, research of intercalation type,thickness and distribution is very important in the geological condition evaluation of the bottom water reservoir controlled by water aggression. This paper comprehensively uses logging data, core and other data for researching the types and characteristics of the intercalation developed in the reservoir of Triassic in Tahe 1 area. The results show that the intercalation in study area can be divided into calcite sandstone intercalation, muddy intercalation and physical property intercalation. Vertically, the intercalation is commonly distributed in the top of the rhythm layer or near the oil-water interface; horizontally, all types of intercalation are widely developed at high structure position of Tahe 1 area, and the muddy intercalation and physical property intercalation always can be connected in a range. The water breakthrough time is comparatively long and the rise of water saturation is comparatively slow, which indicates that the intercalation developed area blocked the bottom water coning (vertiacal well) and the bottom water cresting (horizontal well) during the reservoir exploitation.