旋转掀斜斜坡区构造—沉积演化特征及油气地质意义——以渤海湾盆地歧口凹陷板桥斜坡为例

发布时间：2018-11-18 13:35

【摘要】：为明确旋转掀斜斜坡区构造—沉积演化特征及其对岩性油气藏的控制作用,以渤海湾盆地歧口凹陷板桥斜坡区为例,运用地震、测井及岩心薄片等资料,分析了板桥斜坡构造演化特征、不同构造阶段沉积特征及其与岩性油气藏成藏的关系。认为板桥斜坡古近纪经历了"整体沉降—旋转掀斜"2个阶段,古地貌具有"早缓—晚陡"的特征,古构造经历早期单斜—晚期箕状的演化过程。E_(3s3)-E_(3 s_1~x)以构造整体沉降为主,古地貌平缓,沧县隆起物源向整个斜坡区大面积输送,发育大型辫状河三角洲沉积,前缘砂体在现今缓坡区叠置连片;E_(3s_1~z)-E_3 d发生旋转掀斜,斜坡区主体发生构造反转,形成现今箕状格局。板桥斜坡大面积缓坡为岩性圈闭形成提供构造背景,早期古地貌平缓有利于缓坡区优质砂体叠置连片,晚期旋转掀斜有利于上倾尖灭岩性圈闭形成。板桥斜坡中、低缓斜坡区E3sx1三角洲前缘水下分支河道有利砂体叠置连片,储集物性好,与油源断层匹配,是岩性油气藏勘探有利地区。据此,在缓坡区新落实多个岩性圈闭发育带,部署完钻的12口井相继获得高产油气流,圈闭钻探成功率高达85%。
[Abstract]:In order to clarify the characteristics of tectonic-sedimentary evolution and its controlling effect on lithologic reservoirs in the rotary tilting slope area, taking Banqiao slope area of Qikou sag in Bohai Bay Basin as an example, seismic, logging and core slice data are used. The structural evolution characteristics of Banqiao slope, sedimentary characteristics of different structural stages and their relationship with lithologic reservoir formation are analyzed. It is considered that Banqiao slope experienced two stages of "integral subsidence and rotation tilting" in Paleogene, and the paleogeomorphology was characterized by "early slow-late steepness". The paleotectonics experienced an early monocline to late graben-like evolution. The E _ (3s3) -E _ 3s _ (1) x was mainly tectonic subsidence, paleogeomorphology was gentle, and the provenance of Cangxian uplift was transported to the whole slope area in a large area. Large braided river delta deposits are developed and the front sand bodies are overlaid in the present gentle slope area. The rotation tilting of E _ (3s_1~z) -E _ T _ 3 d and the structural reversal of the main body of slope area formed the present graben-like pattern. The large area gentle slope of Banqiao slope provides the tectonic background for the formation of lithologic traps, the early paleogeomorphology is favorable to the superposition of high-quality sand bodies in the gentle slope area, and the late rotating tilting is conducive to the formation of lithologic traps at the updip tip. In Banqiao slope, the E3sx1 delta front subaqueous branch channel in Banqiao slope is favorable for sand body superposition, good reservoir physical property, matching with oil source fault, and is favorable area for lithologic reservoir exploration. On this basis, several lithologic trap development zones have been newly implemented in the gentle slope area, and 12 wells have been deployed to obtain high oil flow. The success rate of trap drilling is as high as 85%.
【作者单位】：中国石油大港油田分公司勘探开发研究院;中国石油大港油田分公司勘探事业部;中国石油大港油田公司对外技术股份公司;
【基金】：大港油区大油气田勘探开发关键技术研究项目“歧口凹陷油气分布规律深化研究”课题(编号:2014E-06) 中国石油科技重大专项“大港油区大油气田勘探开发关键技术研究”(编号:2014E-06)联合资助
【分类号】：P618.13

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