大庆长垣杏56井区P1油层组沉积微相分析

大庆杏树岗油田杏56区块P1段发育典型的水退阶段的三角洲沉积。其总体沉积特征为：河道频繁分支与迁移，发育各种沉积构造及生物遗迹化石。本文通过对松辽盆地杏树岗油田杏56井区大量钻井岩芯、测井和区域沉积相等资料的分析研究，认为杏56井区的P1段沉积为正常三角洲沉积，并划分出9类岩相、两种沉积亚相和10种微相。研究认为P14及其以下为三角洲沉积中的前缘亚相沉积，这一阶段整体呈现水退趋势。P11～P13段沉积为三角洲沉积中的平原亚相，这一阶段整体呈现水进趋势。三角洲前缘物源供给不足，砂体厚度较薄，砂泥互层较多，至三角洲平原，物源供给充足，砂体增厚。

Microfacies Study of P1 Section of Xing 56 District in Daqing Oil-field

The P1 section of Xing 56 Dsitrct in Xingshugang Oil--field, Daqing Region developed classic dereliction delta. The total sedimentation was that rivers were branching and migrating frequently, and the sedimentary structures and fossil of ichnite were growing generally. Based on the study of great quantity of core, well logging, area precipitation facies, this paper calculated the sediment in Xing 56 District was the regular delta sediment, classified 9 lithofacies, 2 subfacies and 10 microfacies. The sediment in P14 and under it was the delta front, belonged to the dereliction phase. The sediment in P11--P13 was delta plain, belonged to the ingress phase. The scarce source in delta front resulted the thickness of sand was thin, and the sand and mud grew alternately. To delta plain, the adequate source resulted the thickness of sand was thicken, and the main microface was the channel.