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首页> 外文会议>SPE 7th Latin American and Caribbean petroleum engineering conference >The Sand-Rich and Mixed Sand-Mud Ramp Deep-Water Depositional Systems of the Apiuna Unit (Santa Catarina State, Brazil): a Challenge to Decrease the Unrecovered Oil
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The Sand-Rich and Mixed Sand-Mud Ramp Deep-Water Depositional Systems of the Apiuna Unit (Santa Catarina State, Brazil): a Challenge to Decrease the Unrecovered Oil

机译：Apiuna单元（巴西圣卡塔琳娜州）的含沙量丰富的混合砂泥坡道深水沉积系统：减少未采出石油的挑战

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摘要

A 3D model of an ancient sand-rich and mixed mud-sandrnramp deep-water sedimentary environment, outcropping nearrnApiuna, Santa Catarina State, Brazil, is presented. Thisrnresearch contributes in the following way to the upstreamrnsector of the petroleum industry: I) with a 3D conceptualrnmodel of reservoirs in ramp deep-water systems and ii) withrn2D synthetic seismograms based on real outcrops.rnThe first contribution refers to a more refined 3D conceptualrnmodel for the reservoirs. The proposed architectural model isrnmore complicated than the previous interpretations which sawrnthe deposits of Apiuna unit as a channel-lobe system in arndeep-water fan. In this new model, two type of ramp arernrecognized. One, sand-rich, is characterized by extensivernsandy-sheet reservoirs, not linked to proximal channels andrnshowing an apparent casuality of construction. The sandyrnsheets vary downcurrent their lithologic features as function ofrna density-stratified flow: debris flow s.l. in the lower part ofrnthe sedimentary flux and turbidity current in the upper part.rnThe second type of ramp, mixed sand-mud, is characterized byrna channel-levee complex. The two mentioned ramp systemsrnrepresent the variation of the depositional environmentrncontrolled probably by tectonic-morphologic factors.rnConstruction of synthetic seismograms by using extensive 2Drngeologic models evaluated from outcrop data is the other partrnof this work. The properties needed for constructing thernsynthetic seismograms, which are densities and P-wavernvelocities of each stratigraphic unit, are evaluated fromrnappropriate petrophysical tables. Synthetic seismograms arernthen used to qualitatively analyse the seismic response of arnstratigraphic column. Correlation of each generatedrnseismogram with the respective stratigraphic column allowsrnidentifying small-scale features not visible within the range ofrnseismic frequencies.
机译：呈现了一个古老的富含沙子和泥浆-砂岩的深水沉积环境的3D模型，该岩层露头于巴西圣卡塔琳娜州的阿皮纳附近。这项研究对石油行业的上游部门做出了以下贡献：I）具有斜坡深水系统储层的3D概念模型； ii）基于真实露头的2D合成地震图。水库。所提出的建筑模型比以前的解释更为复杂，因为以前的解释将Apiuna单元的沉积物视为深水风扇中的通道瓣系统。在这种新模型中，两种类型的斜坡被识别。其中一个沙质丰富，其特征是广泛的砂岩储层，不与近端通道相连，并且显示出明显的施工伤亡。砂岩下游流体的岩性特征随核密度分层流的变化而变化：泥石流s.l。斜坡的第二种类型是混合沙泥，其特征是河道-堤坝复合体。提到的两个斜坡系统代表着可能受构造形态学因素控制的沉积环境的变化。这项工作的另一部分是通过使用从露头数据评估得到的广泛的二维地质模型来构造合成地震图。从适当的岩石物理表中评估了构造合成地震图所需的属性，即每个地层单元的密度和P波速度。然后使用合成地震图定性分析地层柱的地震反应。每个产生的地震图与相应的地层柱的相关性允许识别在地震频率范围内不可见的小尺度特征。

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