河口坝成因主控因素分析实验模拟

Analysis on Main Genesic Factors of Debouch Bar Based on Experimental Simulation

胜坨油田沙二段8砂组主要为辫状河三角洲河口坝沉积砂体,通过三角洲水槽模拟实验,探讨实验条件下河口坝发育的主要控制因素,为生产实践提供理论基础。实验研究表明,河口坝发育主要受底形坡度、物源供给、流量大小、构造沉降及沉积水深等五个主要因素控制。其中,底形坡度主要影响河口坝砂内部形态保存状况,物源供给是形成河口坝的物质基础,流量大小影响河口坝发育速率,构造沉降控制河口坝平面分布和垂向叠置情况,沉积水深决定河口坝厚度。

The Es2 8th sand group in Shengtuo Oilfield is the typical braided river delta deposition. Through physical simulation, the main control factors for debouch bar developing under the conditions of experiments are discussed here so as to provide the theoretical basis for production practice. The experimental results show that the bottom slope, prove- nance supplement, stream discharge , tectonic subsidence and sedimentary water-depth are the main controlling factors Among them, the bottom slope mainly has an effect on the internal morphology preservation of the debouch bar sand, the provenance is the material foundation forming the debouch bar, the runoff affects the debouch bar developing rate, the tectonic subsidence controls the horizontal distribution and vertical superimposition of the debouch bar, and the sedimen- tary water-depth controls the thickness of the debouch bar.