百口泉油田检188井区侏罗系八道湾组沉积相特征

Characteristics of Depositional Facies Badaowan Formation, Jurassic of Jian 188 Well Block, Baikouquan Oil Field

以沉积学和测井地质学理论为指导,对百口泉油田检188井区170余口井的测井和钻井资料以及部分露头资料进行了综合研究。用旋回对比、标志层对比和电测曲线相似性对比等地层划分对比原则将侏罗系八道湾组划分为12小层。对各小层进行了沉积相分析,认为八道湾组为一种潮湿-半干旱气候环境下的辫状河沉积,共发育主河道、支河道和泛滥平原3种亚相,发育水道、心滩、河漫滩和河漫沼泽4种微相。其中J1b8-5～J1b7小层主要发育主河道和支河道,物源主要来自西北方向;J1b6～J1b3小层主要发育河道和河漫滩,物源来自正北和西北两个方向;J1b2～J1b1小层以发育河漫沼泽为主,物源来自西北方向。沉积演化表明,八道湾组沉积时早期气候较干旱,晚期气候较潮湿,其沉积经历了一次较完整的水进-水退过程。

Guided by the sedimentary geology and well logging geology, this paper studies the drilling data, the well logging data, and the well cores and outcrop data of more than 170 wells in Jian 188 well block, Baikouquan oilfield. The Badaowan Formation is divided into 12 substrata according to the correlation methods of sedimentary cycles, index horizons and the similarity of the resistivity curves. The sedimentary facies of each substratum is analyzed and the Badaowan Formation is found to be a braid river sedimentary facies developed in a humid-half arid climate and environments. Three sedimentary subfacies are developed in Badaowan Formation： the main river channel, the branch river channel and the fluvial-flood plain; four sedimentary microfacies are developed in Badaowan Formation： the channel, the channel bar, the flood plain and the marsh. The main river channel and the branch river channel are mainly developed in J1b^8-5-J1b^7 substrata, and the provenance comes from the northwest of the target area. The river channel and the flood plain are mainly developed in J1b^6-j1b^3 substrata, and the provenance comes from the northwest and the north of the target area. The marsh is mainly developed in J1b^2- J1b^1 substrata, and the provenance comes from the northwest of the target area. The arid climate prevailed when the lower Badaowan Formation was deposited and it became humid when the upper Badaowan Formation was deposited. The Badaowan Formation has undergone an integral aggression-regression process according to the comprehensive analysis of the sedimentary evolution history.