摘要:
浊积体油藏储层空间展布特征的研究对于该类型油气藏的储量评价和高效开发有着重要意义。XX20-2北油田东二下段的浊积体油气藏仅为XX20-2N-2井钻遇,相邻1.9 km较低部位的XX20-2-13井未钻遇储层。由于该浊积体埋深超过2 000 m,单靠地震资料难以达到定量研究储层空间展布的要求。区域沉积体系分析显示,该油气藏为发育在湖泊相沉积背景下的三角洲滑塌浊积扇沉积,主要物源来自北部的辽河水系和凌河水系形成的大型三角洲;利用该区浊积体特殊地震反射特征,借助地震相识别技术,详尽刻画了砂体的空间展布特征和边界;利用测试取得的压力数据进行试井分析发现,在2井周边880 m范围内,储层物性和连通性较好,说明浊积体展布半径要更大;利用得出的浊积体地质模型进行模型正演发现,正演结果与实际地震剖面吻合较好,从而证实了浊积体空间展布及边界的推断。
Abstract:
The understanding of the distribution of a turbidite reservoir is critical for reserve assessment and oilfield development. The turbidite reservoir at the E3d2L Formation of the XX20-2N Oilfield is buried at a depth more than 2000 m below sea level. It is difficult to make clear the distribution pattern of the turbidite reservoir only by seismic information. Regional research reveals that the turbidite reservoir was a lacustrine turbidite caused by the sliding of the deltaic front. We applied all the approaches, such as depositional system study, facies modeling, seismic facies analysis, well testing and DST pressure data, in this study to delineate the boundaries and dimensional features of the turbidite sand reservoir. The results of the study were useful for calculation of the net pay thickness of oil and gas unit and increasing the precision of reserve calculation so as to decrease the risk thereof.
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