东营凹陷南部重力异常地质成因
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摘要
引起重力异常的地质因素非常复杂,要对其做出合理地质解释,不仅需要精细分离重力异常,而且需要与其他资料结合。从重力正演模拟出发,分析了可能产生重力异常的地质因素,以及不同地质体的重力响应形态。在此基础上,利用垂向二阶导数及其他信息增强技术,有效提取东营凹陷南部地区局部重力异常,结合地震、钻井资料,进行了地质成因推断分析,认为影响该区重力局部正异常的地质因素主要是古潜山(包括断块山和残丘山)、盖层构造以及其他如陡坡带砂砾岩体等,古潜山的分布多受大断裂控制,平面上成带连片分布;而区域重力异常则反映了该区的区域构造特征。应用效果表明,在地震成熟勘探区,高精度重力不仅可以发现一些新的地质目标,而且与地震相结合,在诸如深层构造、潜山、有规模的隐蔽性断裂等目标的落实方面,也可以发挥积极作用。
Gravity anomalies caused by geological causes are extremely complex.It is necessary to make a reasonable geological interpretation requires not only precise gravity anomaly separation,but also close integration with other informations.Beginning from the gravity forward modelling,geological factors caused gravity anomalies and their different geological body patterns in response to gravity were analyzed.Based on that,the vertical second derivative, and other technologies of enhancing information can be used for extraction of the southern Dongying local gravity anomaly. Combined with seismic and drilling data,a geological origin was analyzed.The area of local gravity anomaly of geological factors are mainly buried hills(including fault-block mountains and hammock),cap structure,as well as other structures such as steep slope glutenite and so on.The distribution of buried hill is controlled by the major fractures as zonality on plane.The regional gravity anomaly reflects the regional tectonic features of the area.Application results show that a mature exploration area with the earthquake,high-precision gravity can find not only some new geological targets,but also the targets of deep structure, buried hill,and a scale of hidden fractures combined with the earthquake,which will play an active role.
Gravity anomalies caused by geological causes are extremely complex.It is necessary to make a reasonable geological interpretation requires not only precise gravity anomaly separation,but also close integration with other informations.Beginning from the gravity forward modelling,geological factors caused gravity anomalies and their different geological body patterns in response to gravity were analyzed.Based on that,the vertical second derivative, and other technologies of enhancing information can be used for extraction of the southern Dongying local gravity anomaly. Combined with seismic and drilling data,a geological origin was analyzed.The area of local gravity anomaly of geological factors are mainly buried hills(including fault-block mountains and hammock),cap structure,as well as other structures such as steep slope glutenite and so on.The distribution of buried hill is controlled by the major fractures as zonality on plane.The regional gravity anomaly reflects the regional tectonic features of the area.Application results show that a mature exploration area with the earthquake,high-precision gravity can find not only some new geological targets,but also the targets of deep structure, buried hill,and a scale of hidden fractures combined with the earthquake,which will play an active role.
引文
[1]曾华霖.重力场与重力勘探[M].北京:中国地质大学出版社, 2005.
[2]揭景荣,阎汉杰,苗永康,等高精度重力协同地震识别潜山与断裂技术的开发应用[J].油气地质与采收率,2008,15(1):59- 62.
[3]黄仲良.石油重、磁、电法勘探[M].东营:石油大学出版社, 1998.
[4]王永诗.箕状断陷湖盆滑脱潜山油气成藏模式——以富台油田为例[J].油气地质与采收率,2004,11(4):13-15.
[5]贾霍甫,徐思煌.东营凹陷通王地区负反转构造与断块型古潜山的形成[J].油气地质与采收率,2006,13(3):19-21.
[6]石砥石,白鹏.沾化凹陷上第三系油气成藏与断层关系的探讨[C]//李丕龙.复式油气田论文集.北京:石油工业出版社, 2002:80-84.
[7]阎汉杰.差值趋势面分析的数学探讨及其在重力勘探中的应用[M].北京:地质出版社,1991:56-69.
[8]郑亚斌,黄海平,周树青,等.牛庄洼陷—八面河油田油气运移规律[J].油气地质与采收率,2007,14(6):43-46.
[9]李丕龙,翟庆龙,荣启宏,等.东营凹陷中央背斜带油气运移聚集特征[J].石油勘探与开发,2000,27(4):64-67.
[2]揭景荣,阎汉杰,苗永康,等高精度重力协同地震识别潜山与断裂技术的开发应用[J].油气地质与采收率,2008,15(1):59- 62.
[3]黄仲良.石油重、磁、电法勘探[M].东营:石油大学出版社, 1998.
[4]王永诗.箕状断陷湖盆滑脱潜山油气成藏模式——以富台油田为例[J].油气地质与采收率,2004,11(4):13-15.
[5]贾霍甫,徐思煌.东营凹陷通王地区负反转构造与断块型古潜山的形成[J].油气地质与采收率,2006,13(3):19-21.
[6]石砥石,白鹏.沾化凹陷上第三系油气成藏与断层关系的探讨[C]//李丕龙.复式油气田论文集.北京:石油工业出版社, 2002:80-84.
[7]阎汉杰.差值趋势面分析的数学探讨及其在重力勘探中的应用[M].北京:地质出版社,1991:56-69.
[8]郑亚斌,黄海平,周树青,等.牛庄洼陷—八面河油田油气运移规律[J].油气地质与采收率,2007,14(6):43-46.
[9]李丕龙,翟庆龙,荣启宏,等.东营凹陷中央背斜带油气运移聚集特征[J].石油勘探与开发,2000,27(4):64-67.
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