A 油田断裂调节构造坡折带特征及其控砂模式

A 油田在东营期断裂活动剧烈而复杂，平面上表现为三角洲朵叶体的迁移，纵向上表现为多期砂体叠置，地层厚度和砂体发育程度具有强烈的不均一性。通过对研究区断裂活动以及断裂活动控制形成的调节构造坡折带特征的研究，发现东营期在主走滑断层右旋走滑运动下，产生了大量具有张扭性质的伴生断层，这些不同规模、不同产状的断层在空间上的组合形成了多种调节构造坡折带类型，对物源的导入及其向凹陷中心的多级分散具有明显控制作用，尤其是形成的断沟、断槽等古地貌对物源供给水系起着重要的汇聚和引导作用。受调节构造坡折带影响，目的层段在研究区范围内存在东西两个物源，主要发育三角洲前缘和前三角洲两种亚相及水下分流河道、河口坝、席状砂、浊积砂等多种微相。

Characteristics of Fault Accommodation Structure Slope Break#br#Zone and the Sand Control Pattern in A Oilfield

The study finds that the faults activities are severe and complicated during Dongying Formation in A Oilfield. Thesedimentary face is expressed in delta lobes migration in the plane and superimposed sand body in the longitudinal stage，andthe thickness of formation and the degree of sand body are of strong heterogeneity. The dextral movement of main strikeslipgenerated a large amount of associated faults with characteristics of transtension. The faults of different size and attitudedistributed in space form a various types of fault accommodation structure-type slope break belts，and they obviously controlthe import of source and multistage dispersion to the centre of sag. Especially the formation of gap and faulted trough play animportant role in the convergence and guidance of the drainage system. Under the effects of fault accommodation structure-slopebreak zone，there are two sources within the study area，and the sedimentary face of interval is deltaic environment and the deltacould be further separated into three subfacies including delta plain，delta front，former delta and many kinds of microfaciessuch as distributary channel，mouth bar，sheet sand，turbidite sand and so on.