川东南DS地区龙马溪组页岩裂缝发育特征及期次解析
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摘要
裂缝发育特征和期次对页岩气储集空间的研究非常重要。以川东南DS地区龙马溪组为例,通过对地表及岩心裂缝观测分析和样品采集,开展了裂缝分期配套、构造反演、磷灰石裂变径迹测年和包裹体测温,确定了裂缝的发育特征和期次。研究表明,川东南DS地区龙马溪组页岩内发育了2套平面剪切缝和1套剖面剪切缝,这些裂缝形成于3期构造运动。第1期为NNW、NWW向和NE向裂缝,以方解石和黄铁矿全充填为主,形成于燕山运动中-晚期,磷灰石裂变径迹测年为67.8～58.6 Ma,包裹体测温为295～325℃;第2期为NNE向、NEE向平面剪切缝和NW向剖面剪切缝,以方解石半充填为主,形成于燕山末-喜山中期,磷灰石裂变径迹测年为58.6～18.2 Ma,包裹体测温为297～309℃;第3期为NNE向、NEE向平面剪切缝和NW向剖面剪切缝,并对前期裂缝进行改造,裂缝以未充填为主,形成于喜山运动末期以来,磷灰石裂变径迹测年为18.2～7.8 Ma,包裹体测温为189～232℃。
The characteristics and phases of fracture development are very important for the study of shale gas reservoir space. Taking Longmaxi Formation of DS area in the southeast Sichuan Basin as an example, based on the observation and analysis of outcrops and cores, the fracture stages, structural inversion, this paper discusses apatite fission track dating and inclusion temperature measurement to determine the development characteristics and period of cracks. The research shows that two sets of plane shear fractures and a set of profile shear fractures develop under the action of the three-phase tectonic movement in the study area. Those in the first phase formed in the middle and late period of Yanshan tectonic movement. The directions of the fractures include NWW,NNW and NE, maninly filled by the calcite and pyrite. The homogeneous temperature of inclusions is 295-325℃, and the apatite fission track age ranges from 67.8 to 58.6 Ma. The tectonic fractures in the second phase emerged at the end of Yanshan tectonic movement and the middle period of Himalayan tectonic movement. The directions of the fractures include NNE, NEE and NW, mainly half filled by calcite. The homogeneous temperature of inclusions is 297-309℃, and the apatite fission track age ranges from 58.6 to 18.2 Ma. The tectonic fractures in the third phase shaped at the end of Himalayan tectonic movement. The directions of the fractures include NNE, NEE and NW, and the fractures are mainly unfilled. The third stage is to transform the earlier fractures, when the homogeneous temperature of inclusions is 189-232℃, and the apatite fission track age ranges from 18.2 to 7.8 Ma.
The characteristics and phases of fracture development are very important for the study of shale gas reservoir space. Taking Longmaxi Formation of DS area in the southeast Sichuan Basin as an example, based on the observation and analysis of outcrops and cores, the fracture stages, structural inversion, this paper discusses apatite fission track dating and inclusion temperature measurement to determine the development characteristics and period of cracks. The research shows that two sets of plane shear fractures and a set of profile shear fractures develop under the action of the three-phase tectonic movement in the study area. Those in the first phase formed in the middle and late period of Yanshan tectonic movement. The directions of the fractures include NWW,NNW and NE, maninly filled by the calcite and pyrite. The homogeneous temperature of inclusions is 295-325℃, and the apatite fission track age ranges from 67.8 to 58.6 Ma. The tectonic fractures in the second phase emerged at the end of Yanshan tectonic movement and the middle period of Himalayan tectonic movement. The directions of the fractures include NNE, NEE and NW, mainly half filled by calcite. The homogeneous temperature of inclusions is 297-309℃, and the apatite fission track age ranges from 58.6 to 18.2 Ma. The tectonic fractures in the third phase shaped at the end of Himalayan tectonic movement. The directions of the fractures include NNE, NEE and NW, and the fractures are mainly unfilled. The third stage is to transform the earlier fractures, when the homogeneous temperature of inclusions is 189-232℃, and the apatite fission track age ranges from 18.2 to 7.8 Ma.
引文
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[15] 张金川,张培先,宋晓薇.福特沃斯盆地Barnett页岩气藏特征及启示[J].地质科技情报,2009,28(2):87-93.
[16] 陕亮,张万益,罗晓玲,等.页岩气储层压裂改造关键技术及发展趋势[J].地质科技情报,2013,32(2):156-162.
[17] 丁文龙,曾维特,王濡岳,等.页岩储层构造应力场模拟与裂缝分布预测方法及应用[J].地学前缘,2016,23(2):63-74.
[18] Anderson E M. On lineation and petrofabric structure,and the shearing movement by which they have been produced[J].Quarterly Journal of the Geological Society of London,1948,104:99-132.
[19] 王东.川东南桑木场-酒店垭构造形成演化与多期流体充注[C].成都:成都理工大学,2009:1-106.
[20] 刘建章,陈红汉,李剑,等.运用流体包裹体确定鄂尔多斯盆地上古生界油气成藏期次和时期[J].地质科技情报,2005,34(4):60-66.
[2] Bustin R M.Gas shale tapped for big pay[J].AAPG Explorer,2005,26(2): 5-7.
[3] Martinesu D F.History of the newark east field and the Barnett shale as a gas reservoir[J].AAPG Bulletin,2007,91(4):399-403.
[4] 谭淋耘,徐铫,李大华,等.页岩气成藏主控因素与成藏模式研究:以渝东南地区五峰组-龙马溪组为例[J].地质科技情报,2015,34(3):126-132.
[5] 丁文龙,李超,李春燕,等.页岩裂缝发育主控因素及其对含气性的影响[J].地学前缘,2012,19(2):212-220.
[6] Bowker K A. Barnet hile gas production,Fort Worth Basin:Issues and discussion[J].AAPG Bulletin,2007,91(5):523-533.
[7] Zou C N,Yang Z,Zhu R K,et al.Progress in China′s unconventional oil & gas exploration and development and theoretical technologies[J].Acta Geologica Sinica(English Edition),2015,89(3):938-971.
[8] 蒲泊伶,董大忠,耳闯,等.川南地区龙马溪组页岩有利储层发育特征及其影响因素[J].天然气工业,2013,33(12):41-47.
[9] Guo X S,Hu D F,Li Y P,et al.Geological features and reservoiring mode of shale gas reservoirs in Longmaxi Formation of the Jiaoshiba area[J].Acta Geologica Sinica(English Edition),2014,88(6):1811-1821.
[10] Wang R,Ding W,Zhang Y,et a1.Analysis of developmental characteristics and dominant factors of fractures in Lower Cambrian marine shale reservoirs: A case study of Niutitang formation in Cen′gong block,southern China[J].Journal of Petroleum Science and Engineering,2016,138:31-49.
[11] Nelson R A.Geologic analysis of naturally fractured reservoirs[M].Second edition.[S.l.]:Gulf Professional Pub.,2001.
[12] 李天义,何生,杨智.海相优质烃源岩形成环境及其控制因素分析[J].地质科技情报,2008,27(6):63-70.
[13] Fan C H,Qin Q R.Characteristics and formation stages of the reservoir fractures of the Xujiahe Formation in the fault-fold belt of the central Yuanba area of the Sichuan Basin[J].Journal of the Balkan Tribological Association,2016,22(2):1049-1062.
[14] 魏祥峰,赵正宝,王庆波,等.川东南綦江丁山地区上奥陶统五峰组-下志留统龙马溪组页岩气地质条件综合评价[J].地质论评,2017,63(1):153-164.
[15] 张金川,张培先,宋晓薇.福特沃斯盆地Barnett页岩气藏特征及启示[J].地质科技情报,2009,28(2):87-93.
[16] 陕亮,张万益,罗晓玲,等.页岩气储层压裂改造关键技术及发展趋势[J].地质科技情报,2013,32(2):156-162.
[17] 丁文龙,曾维特,王濡岳,等.页岩储层构造应力场模拟与裂缝分布预测方法及应用[J].地学前缘,2016,23(2):63-74.
[18] Anderson E M. On lineation and petrofabric structure,and the shearing movement by which they have been produced[J].Quarterly Journal of the Geological Society of London,1948,104:99-132.
[19] 王东.川东南桑木场-酒店垭构造形成演化与多期流体充注[C].成都:成都理工大学,2009:1-106.
[20] 刘建章,陈红汉,李剑,等.运用流体包裹体确定鄂尔多斯盆地上古生界油气成藏期次和时期[J].地质科技情报,2005,34(4):60-66.