准噶尔盆地莫索湾地区清水河组成藏特征及模式

Reservoir Characteristics and Model of the Qingshuihe Formation in the Mosuowan Area of Junggar Basin

准噶尔盆地莫索湾地区位于中央坳陷莫索湾凸起上,紧邻盆地的主要生排烃凹陷,成藏条件优越。白垩系清水河组具有良好油气显示,盆参2井试油荻油流,该区为清水河组高效油藏勘探新领域。运用地质、工程、地震一体化研究技术,对莫索湾地区清水河组油藏类型、主控因素、成藏特征以及成藏模式进行了分析。莫索湾地区构造位置有利,深层油源断裂和浅层运移断裂发育且匹配良好,油藏类型为"泥包砂"型高效岩性油藏;同时,广泛发育水进型滨浅湖退积滩坝砂体,储层质量优良,物性随埋深增加变好。油气藏符合烃源灶+断裂泵+岩性体的"三位一体"成藏总模式,烃源灶是起点和油源,断裂泵是动力和通道,岩性体是载体和圈闭,三者共同控制了清水河组油气的生成、运移、聚集和成藏以及油气藏的类型和分布。

The Mosuowan area of Junggar Basin where reservoir forming conditions are good is located in the Mosuowan uplift in the central depression basin, adjacent to the main hydroarbon generating sags. The Cretaceous Qingshuihe Formation has good oil and gas expressions, where PC2 has seen oil flow, and this area has become the new locality of high- efficiency reservoir exploration in the Qingshuihe Formation. This work has analyzed the reservoir types, main control factors, reservoir characteristics and model of the Mosuowan area by using the integrated approach of geology, engineering, and seismology. The tectonic setting of the Mosuowan area is favorable, where deep oil source faults and shallow faults developed well in a good match manner. The reservoirs are of the type ＂mud pack sand＂ with efficient lithology. At the same time, transgressive shore shallow lacustrine retrogradational beach bar sand bodies are extensively present, reservoir quality is good and physical properties become better with increasing buried depth. These reservoirs can be explained by the ＂three-in-one＂ accumulation model： hydrocarbon kitchen ＋ fracture pump ＋ lithologic body. The hydrocarbon kitchen is the starting point and oil source, the fault pump is the power and channel, and lithologic body is the carrier and trap, which jointly control petroleum generation, migration, aggregation and accumulation as well as reservoir types and distribution in the Qingshuihe Formation.