Thermodynamic Impact on Deepwater Sandstone Diagenetic Evolution of Zhuhai Formation in Baiyun Sag, Pearl River Mouth Basin
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摘要: 珠江口盆地白云凹陷位于中国南海北部,是目前我国深水油气勘探研究的重要区域.盆地现今大地热流值为24.2~121.0 mW/m2,单井现今地温梯度(Gra)最高可达6.64 ℃/100 m,具"热盆"属性.白云凹陷裂后沉降阶段,特别是白云运动(23.8 Ma)发生之后,盆地由断裂控盆转变为断裂、热作用共同控盆,热作用及热动力条件成为控制研究区储层成岩演化过程的重要因素,珠海组地层的镜质体反射率值、砂岩中次生流体包裹体均一温度、热液成因自生矿物等热流背景及岩石学记录为这一观点提供了有力证据.通过铸体薄片显微镜下观察与定量统计、电镜扫描观察、X-射线衍射分析等,发现白云凹陷北部中-低地温梯度(LGR,Gra ≤ 4.5 ℃/100 m)和南部高地温梯度(HGR,Gra>4.5 ℃/100 m)两个地区珠海组砂岩的成岩作用特征、成岩演化过程存在以下差异:(1)中-低地温梯度地区珠海组砂岩的压实作用主要是静岩压实作用;高地温梯度地区珠海组砂岩的原生孔隙受静岩压实作用和热压实作用的共同控制,压实减孔速率高,等孔隙度埋深显著变浅;(2)地层升温速率的增大加快了储层中粘土矿物转化的速率,高地温梯度地区高岭石消失的埋深界限较中-低地温梯度地区浅,I/S(伊利石/蒙皂石混层)有序化进程较中-低地温梯度地区有所加快;(3)中-低地温梯度地区珠海组砂岩成岩演化过程属正常有序演变,高地温梯度地区受构造热事件的影响明显,深部流体参与了高地温梯度地区珠海组砂岩的成岩演化过程,地层孔隙水物质交换过程复杂,成岩演化进程加快,改变了碳酸盐矿物溶解-沉淀热平衡状态,各成岩作用过程活跃并出现一些典型的热液成因自生矿物组合.Abstract: Baiyun sag, located in Pearl River Mouth basin, South China Sea, is regarded as the major region for oil-gas research and exploration in deepwater area in China. The current heat flow of Pearl River Mouth basin is from 24.2 to 121.0 mW/m2, and the maximum geothermal gradient of single well is measured as 6.64℃/100 m, which proves that the basin is hot. The governing factor of the basin evolution was transformed from fault to fault-thermal collectively during the post-breakup subsidence stage, especially after the generation of the Baiyun movement (23.8 Ma). Since then, the thermal effect is known as one of the crucial elements in controlling the diagenetic evolution of the sedimentary strata in Baiyun sag, which is demonstrated by some petrological and heating records in sedimentary layer, such as the vitrinite reflectance, the homogenization temperatures of secondary fluid inclusions in sandstone and the authigenic minerals of hydrothermal genesis. Baiyun sag can be divided into low geothermal gradient region (LGR, Gra ≤ 4.5℃/100 m) and high geothermal gradient region(HGR, Gra>4.5℃/100 m). Analytical results of observation of casting thin sections, electron microscope scanning, and X-ray diffraction analysis, show the differences between these two regions in diagenetic processes of sandstone in Zhuhai Formation. (1) The compaction of sandstone in LGR is controlled mainly by lithostatic effect, while in HGR it is controlled by both thermal and lithostatic effect so that the isoporosity limit buried depth is more shallow than that in LGR. (2) The increase of heating rate accelerates the transformation progress of clay minerals in stratum, the depth that indicates the vanishment of the kaolinite in HGR is more shallow than that in LGR, and the ordering process of I/S (illite/smectite mixed layer) in HGR is more mature than that in LGR. (3) Deep-sourced fluid is involved in the diagenetic processes of sandstone in Zhuhai Formation in HGR, which is influenced by the tectonic heating event obviously, so that the thermal equilibrium of dissolution-precipitation of carbonate minerals is changed. The exchange process in interstitial water of the stratum is complex and active, and the authigenic hydrothermal minerals are produced in this process.
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图 2 白云凹陷典型单井镜质体反射率(Ro)-埋藏深度关系图
a.Y33-1,Gra=3.56 ℃/100 m;b.P11-1,Gra=4.00 ℃/100 m;c.H21-1,Gra=5.10 ℃/100 m;d.W3-1,Gra=5.30 ℃/100 m;T80:不整合界面,对应36 Ma珠琼运动二幕;T70:不整合界面,对应30.0 Ma南海运动;T60:不整合界面,对应23.8 Ma白云运动;T35:不整合界面,对应13.8 Ma最大海侵期;T32:不整合界面,对应10.5 Ma东沙运动
Fig. 2. Relationship between the vitrinite reflectance(Ro)and burial depth of typical wells in Baiyun sag
图 7 白云凹陷珠海组砂岩成岩作用镜下特征
a.骨架矿物颗粒间以线-凹凸接触为主,铁白云石(Ank)充填粒间孔隙,单偏光200×,Y35-2,Gra=3.93 ℃/100 m;b.方解石(Cal)连晶式胶结交代长石,单偏光100×,Y20-1,Gra=3.54 ℃/100 m;c.高岭石(Kln)充填粒间溶蚀扩大孔隙,结晶度较低,单偏光200×,P11-1,Gra=4.00 ℃/100 m;d.高岭石(Kln)沉淀于长石铸模孔内,单偏光200×,P11-1,Gra=4.00 ℃/100 m;e.粒表丝状伊利石(I)和叶片状绿泥石(Chl),电镜扫描3 870×,H16-2,Gra=3.68 ℃/100 m;f.铁白云石(Ak)、钾长石(Or)及片状伊/蒙混层(I/S)发生溶蚀,电镜扫描2 000×,P11-1,Gra=4.00 ℃/100 m;g.骨架矿物颗粒间线-凹凸接触,石英次生加大边发育,单偏光50×,W3-2,Gra=4.72 ℃/100 m;h.方解石(Cal)充填长石粒内溶孔、交代长石,单偏光200×,W3-2,Gra=4.72 ℃/100 m;i.高岭石(Kln)充填长石粒内溶孔及粒间溶蚀扩大孔,结晶度较高,单偏光200×,W3-2,Gra=4.72 ℃/100 m;j.自生高岭石(Kln)充填于长石铸模孔内,形成于长石溶蚀之后,单偏光100×,W3-2,Gra=4.72 ℃/100 m;k.石膏(G)、片状伊/蒙混层(I/S)充填粒间孔隙,电镜扫描6 000×,W6-1,Gra=6.67 ℃/100 m;l.铁方解石胶结(Cal)孔隙式胶结,并发生溶蚀,单偏光100×,W21-1,Gra=6.64 ℃/100 m
Fig. 7. Diagenetic characteristics of sandstone in Zhuhai Formation in Baiyun sag
表 1 白云凹陷珠海组砂岩中流体包裹体均一温度数据统计
Table 1. Data statistics of homogenization temperatures of fluid inclusions in sandstone in Zhuhai Formation, Baiyun sag
岩石类型 宿主矿物及产状 均一温度(℃) 测点数(个) 范围 平均值 砂岩 切穿石英颗粒愈合裂隙 89.7~192.0 157.4 33 石英次生加大边 142.0~215.0 187.9 3 石英颗粒表面微裂隙 87.9~201.3 138.0 78 -
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