南阳凹陷魏岗油田北部地区滑塌浊积岩发育特征
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摘要
南阳凹陷魏岗油田北部地区主力产层古近系核桃园组的沉积亚相为三角洲前缘-前三角洲,分析认为滑塌浊积体是有利的勘探目标。基于岩心、测井以及地震数据三重约束,在等时层序格架内,对研究区古近系核桃园组二段、三段各小层沉积微相开展了研究。研究表明,H22-H31各亚段顶底部的低位域与高位域的前积过程中,多发育重力失稳型滑塌浊积体。同时,在湖进退积过程中,由于波浪作用亦可发育规模较小的浊积体。依据地震属性数据,结合测井曲线标定,对H22-H31滑塌浊积体的有利发育区进行了预测,认为深湖区是南阳凹陷隐蔽油气藏的远景靶区。
Subtle hydrocarbon reservoirs have become the key exploration target for Nanyang sag in Paleogene system.The sedimentary sub-facies of the main producing layers within paleogene Hetaoyuan formation in northern area of Weigang oilfield,Nanyang sag are delta front-prodelta.The analysis results show the slump turbidite body is the favorable exploration target.Constrained by coring,logging and seismic data,within the isochronous sequence stratigraphic framework,the research on sedimentary sub-facies of paleogene He-2 and He-3 members has been carried out.The research results indicate during the progradational process of low-stand and high-stand at the top and bottom of submembers of H22-H31,more fluxoturbidites of gravitational instability type have been developed.Meantime,duringthe retrogradtional process,turbidites of smaller scale have been developed due to the wave action.Ultimately according to seismic attributes,in combination with logging calibration,the favorable developed area of slump turbidite body for H22-H31 has been predicted and the deep lacustrine area has been considered to be the vision target for subtle hydrocarbon reservoirs of Nanyang sag.
引文
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