山东孤岛油田馆陶组沉积晚期浅水振荡湖泊沉积

浅水振荡湖泊是一种特殊的浅水湖泊沉积类型，湖盆地形平坦、湖面广阔、水体极浅，广大湖区受气候影响湖平面频繁振荡式升降变化，沉积物多表现为氧化、还原环境交替的红灰相间的细粒沉积物。馆陶组馆1+2砂层组沉积时期浅水振荡湖泊广泛发育，表现为高频红、灰泥岩互层、物源供应不足、浅水湖泊沉积构造及生物成因构造发育、水进→水退沉积旋回明显的沉积特征。通过取心井的观察描述和分析化验，识别出水道砂坝、砂坪、混合坪、泥坪和沼泽5种沉积微相类型，建立了孤岛油田馆1+2砂层组浅水振荡湖泊沉积模式。

Shallow Oscillating Lacustrine Sediment of the Late Guantao Formation in Gudao Oilfield, Shandong Province

Shallow oscillating lacustrine deposit is a special kind of shallow lake, while the lake topography is smooth, lake surface is wide, and water body is very shallow. Lake plane which mainly influenced by climate rise or fall in vibrating type. Deposit mainly is mostly alternative red mudstone and grey mudstone, indicating oxidizing and reducing environment. Shallow oscillating lacustrine deposit extensively developed in the late period of Guantao Formation (Ng_1+2 sand sets) in Gudao Oilfield. Deposit features show that high frequency alternative mostly red and grey mudstone, sedimentary structure generally occur in shallow lakes and creature structure growing, water plane rise to decline depositional cycle obviously. Through taking the observation of core hole, describing and analyzing lab test results, five microfacies(water channel, sand flat, mixed flat, mud flat and marsh) can be distinguished and established the high water period and low flow period sedimentary model of Ng_1+2 sand sets in Gudao Oilfield.