碳酸盐岩缝洞型油藏三维地质建模方法——以塔河油田四区奥陶系油藏为例

doi:10.11743/ogg20130315

摘要/Abstract

摘要： 碳酸盐岩缝洞型油藏储集空间类型主要为大型溶洞、溶蚀孔洞及裂缝,尺度大小悬殊,形态不规则,分布不连续。定量刻画孔、洞、缝在三维空间的展布一直是该类油藏开发的技术难题,目前尚缺乏有效的地质建模方法。以塔河碳酸盐岩缝洞型油藏为原型,提出了多元约束碳酸盐岩缝洞型油藏三维地质建模方法,即在古岩溶发育模式控制下,采用两步法建模。第一步,建立4个单一类型储集体模型:首先利用地震识别的大型溶洞和大尺度裂缝,通过确定性建模方法,建立离散大型溶洞模型和离散大尺度裂缝模型;然后在岩溶相控约束下,基于溶洞发育概率体和井间裂缝发育概率体,采用随机建模多属性协同模拟方法,建立溶蚀孔洞模型和小尺度离散裂缝模型。第二步,采用同位条件赋值算法,将4个单一类型模型融合成多尺度离散缝洞储集体三维地质模型。该模型定量刻画了缝洞储集体在三维空间的展布特征,为油田开发奠定了坚实的地质基础。

关键词: 离散裂缝建模, 溶蚀孔洞建模, 离散大型溶洞建模, 地质建模, 碳酸盐岩缝洞型油藏

Abstract: Reservoir spaces of fractured-vuggy carbonates mainly,include large caverns,dissolved pores and fractures,which are varied in scale,irregular in shapes and discontinuous in distribution.There still have no effective geological modeling method for quantitative descriptions of 3D reservoir space distributions in fractured-vuggy carbonate reservoirs.In this paper,taking Tahe fractured-vuggy carbonate reservoir as an example,we put forward a 3D geological modeling method of fractured-vuggy reservoir under the constraint of multiple geological factors,i.e.two-step modeling under the control of ancient karst development pattern.In the first step,4 single-type reservoir models were established.After large cavens and large-scale fractures were identified by using seismic data,a discrete large cavern model and a discrete large-scale fracture model were established first with deterministic modeling method.Then,under the constraint of karst facies and based on development probability volumes of dissolved pores and interwell fractures,a dissolved pore model and a discrete small-scale fracture model were established by using the stochastic multi-attribute coordinated modeling method.In the second step,the 4 single-type reservoir models were merged into a 3D multiscale discrete geological model of fractured-vuggy carbonate reservoirs by using the diadochic assignment algorithm.The final model can quantitatively describe the 3D distribution of the fractured-vuggy carbonate reservoirs,and provide geological foundation for oilfield development.

Key words: discrete fracture modeling, dissolved pore modeling, discrete large cavern modeling, geological modeling, fractured-vuggy carbonate reservoir

中图分类号:

TE121.1

胡向阳,李阳,权莲顺,等. 碳酸盐岩缝洞型油藏三维地质建模方法——以塔河油田四区奥陶系油藏为例[J]. 石油与天然气地质, 2013, 34(3): 383-387. doi: 10.11743/ogg20130315 Hu Xiangyang,Li Yang,Quan Lianshun,et al. Three-dimensional geological modeling of fractured-vuggy carbonate reservoirs：a case from the Ordovician reservoirs in Tahe-Ⅳ block,Tahe oilfield[J]. Oil & Gas Geology, 2013, 34(3): 383-387. doi: 10.11743/ogg20130315

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