Determination of maturity for source rocks in Biyang Sag of Nanxiang Basin and its significance
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摘要: 利用FAMM技术对取自南襄盆地泌阳凹陷15口钻井的19件核桃园组湖相烃源岩样品进行了成熟度厘定。结果显示,烃源岩的镜质体反射率(Ro)抑制程度显著,抑制校正值介于0.08%~0.39%,有机质类型越好,镜质体反射率抑制程度越高。19件烃源岩样品的成熟度均已处于生油窗内(等效镜质体反射率值介于0.58%~1.29%),而非镜质体反射率结果所反映的处于0.38%~1.05%。根据4个钻井不同深度段烃源岩的成熟度确定古地温梯度为36~45℃/km,成烃门限深度为1 800~1 400 m。核桃园组烃源岩成熟度的正确厘定,为合理评价泌阳凹陷石油资源潜力奠定了基础。Abstract: 19 source rock samples of lacustrine facies have been collected from the Hetaoyuan Formation in 15 drilling wells in the Biyang Sag of the Nanxiang Basin, and their maturities have been determined by means of fluorescence alteration of multiple macerals (FAMM) technique. The vitrinite reflectance of source rocks from the Hetaoyuan Formation is obviously suppressed, and the suppression corrected value is from 0.08% to 0.39%. The level of vitrinite reflectance suppression is relatively higher when source rock quality is better. The maturity of 19 samples has entered oil window (EqVR from 0.58% to 1.29%) instead of 0.38%-1.05% from vitrinite reflectance. According to the maturity of source rocks at different depth in 4 wells, paleogeothermal gradient is 36-45℃/km, and the depth of threshold for oil generation is 1 800-1 400 m. The correct determination of maturity for the source rocks from the Hetaoyuan Formation provides the basis to evaluate the potential of hydrocarbon reasonably.
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[1] 蔡佳,罗家群,甘华军,等.南襄盆地泌阳凹陷隐蔽油气藏模式与富集规律[J].石油实验地质,2009,31(3):244-252. [2] 曾小阳,赵得力,孔凡军.泌阳凹陷构造控油规律分析[J].石油天然气学报(江汉石油学院学报),2005,27(3):422-424. [3] 李志明,秦建中,徐旭辉,等.镜质体反射率抑制与烃源岩质量关系:以渤海湾盆地东营凹陷烃源岩为例[J].石油实验地质,2008,30(3):276-280. [4] 张美珍,李志明,秦建中,等.东营凹陷有效烃源岩成熟度评价[J].西安石油大学学报:自然科学版,2008,23(3):12-16. [5] 陈中红,曲江秀,高卫红.牛38井湖相烃源岩镜质体反射率负异常与有机组分含量相关性[J].西安石油大学学报:自然科学版,2009,24(1):29-33. [6] 涂阳发,王正文,张本书,等.泌阳凹陷下第三系成烃研究.南阳:河南油田分公司石油勘探开发研究院,2002:15-37. [7] 罗家群,朱颜,朱景修,等. 泌阳凹陷成烃成藏定量研究地质模型及勘探方向.南阳:中国石化河南油田分公司,2008. [8] Wilkiins R W T,Wilmshurst J R,Russell N J,et al.Fluorescence alteration and the suppression of vitrinite reflectance[J].Organic Geochemistry,1992,18:629-640. [9] Wilkiins R W T,Wilmshurst J R,Hladky G,et al.Should fluorescence alteration replace vitrinite reflectance as a major tool for thermal maturity determination in oil exploration? [J].Organic Geochemistry,1995,22:191-209. [10] 李志明,秦建中,廖宗廷,等. FAMM技术及其应用进展[J].石油实验地质,2005,27(3):307-311. [11] 李志明,施伟军,Sherwood N,等.激光拉曼光谱法分析多种显微组分荧光变化及其应用[J].岩矿测试,2008,27(5):341-345. [12] 肖贤明,刘祖发,申家贵,等.确定含油气盆地古地温梯度的一种新方法:镜质体反射率梯度法[J].科学通报,1998,43(21):2340-2343. [13] Suggate R P.埋深、镜质体反射率及地温梯度之间的相互关系[J].李军,译.石油地质与实验,2002(总61期):40-53. [14] 李志明,徐二社,秦建中,等.烃源岩评价中的若干问题[J].西安石油大学学报:自然科学版,2010,25(6):8-12. -
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