Paleogeomorphology Character of Pre-Jurassic and Its Implications for Hydrocarbon Accumulation Research in Maling Area
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摘要:
为明确鄂尔多斯盆地马岭地区侏罗系古地貌油藏成藏规律，根据岩心、测井、地震等地质资料，以印模法为基本原则、以井震结合补充验证、以三维建模为表现形式，精确刻画了马岭地区前侏罗纪古地貌形态，明确了古地貌具有“两古河夹持一高地、多支沟支坡”的整体特征。对古地貌控藏作用进行了综合研究，认为古地貌形态控制了富县组、延安组延10段沉积微相发育，从而影响了有利储层的展布。马岭地区侏罗系为近源油藏，充足的油气自底部延长组长7段烃源岩沿裂缝、古河谷和不整合面构成的三重油气运移通道向上运移，延安组延10段顶部至延8段的广覆式分流间湾泥岩和煤层作为巨厚盖层为侏罗系圈闭提供了封隔条件。古地貌斜坡区和河间丘为油藏聚集的最有利部位，其次是靠近斜坡区的古河和支沟支河发育的高地。建立了侏罗系古地貌油藏纵向多层系复合成藏模式，该研究为马岭地区下步侏罗系油藏滚动开发指明了方向。
Abstract:In order to clarify the reservoir formation model of Jurassic in Malin area of Ordos basin , Based on logging, seismic and core geological data, by the combination of well seismic and 3D modeling , the prejurassic Palaeogeomorphology has been accurately restored. The palaeogeomorphology in study area is overall characterized by “a plateau between two ancient rivers,many furrows and slopes”. A comprehensive study on the relationship between palaeogeomorphology and reservoir shows that paleogeomorphology controlled the distribution of sedimentary microfacies and indirectly affected the distribution of favorable reservoirs in Fuxian formation and Yan 10 section of Yan’an formation. The Jurassic oil source in Malin area is sufficient which come from the Chang7 section of Yanchang formation source rock. The fissure, ancient river and unconformity surface providing three channels for oil and gas migration. The interdistributary bay microfacies mudstone widely developed as thick caprocks in Yan8–Yan9 formation provided the sealing conditions for Jurassic reservoir trap, The slopezone and the interfluvial are the most favorable position for reservoir accumulation, followed by the ancient river which is near the slopezone and the old upland which is develop branch ditch and river. Established the paleogeomorphic reservoir vertical multi–layer system composite reservoir formation model accumulation model of Jurassic, the study area is composed of vertical multilayer system under the action of vertical migration. The research results point out the direction exploration of Jurassic reservoirs in Malin area for the further.
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Key words:
- Ordos basin /
- Maling area /
- paleogeomorphology /
- oil and gas migration /
- reservoiring pattern
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