Reservoir characteristics and hydrocarbon accumulation significance of metamorphic zones of intrusive rocks and surrounding rocks in second member of Paleocene Funing Formation in Qintong Sag, Subei Basin
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摘要: 火山岩油气藏是油气勘探的重要领域之一。苏北盆地溱潼凹陷侵入岩分布广泛，油气显示活跃，已成为我国东部陆相盆地油气深化勘探和规模增储的重要领域，具备良好的勘探前景。然而，目前针对火山岩对泥页岩围岩储层及其成藏影响的研究较为缺乏，泥页岩围岩变质带能否作为勘探重点领域有待深入评价。为了推动苏北盆地侵入岩围岩变质带新类型油藏勘探，以溱潼凹陷阜二段侵入岩围岩变质带为研究对象，综合岩心、薄片、全岩、测井等资料，系统揭示了泥页岩变质带储层特征，明确了岩浆侵入对阜二段变质带油气成藏的贡献。研究表明，溱潼凹陷阜二段泥页岩受岩浆侵入影响，泥页岩围岩发生蚀变形成环状变质带储层，岩浆的侵入具有明显“增储作用”；变质带储层发育孔隙、裂缝两类储集空间，储层发育程度受侵入岩厚度及烘烤强度控制，岩浆的侵入具有“催熟作用”，同等深度下泥页岩Ro可增加0.4%~0.5%；阜宁组侵入岩形成于吴堡期—三垛期，火成岩侵入形成环状变质带的时间早于油气充注期，具有良好的成藏匹配关系。受岩浆侵入、侵入岩空间分布以及源储匹配关系控制，溱潼凹陷阜二段侵入岩围岩变质带具有源储一体、近源富集的特征，是规模增储的新阵地。Abstract: Volcanic reservoirs play a crucial role in oil and gas exploration. The intrusive rocks in the Qintong Sag of the Subei Basin are widely distributed within active oil and gas deposits, making them a significant area for further exploration and reserve expansion in East China's continental basins. Despite the promising exploration prospects, there is a research gap regarding the impact of volcanics on shale surrounding rock reservoirs and their accumulation potential. It is essential to evaluate whether the shale metamorphic zones could serve as a key exploration target. This study focuses on the metamorphic zones of intrusive rocks and surrounding rocks in the Qintong Sag's second member of the Funing Formation. By integrating core, thin section, whole rock, and well logging data, this work systematically reveals the reservoir characteristics of the mud shale metamorphic zones and defines the contribution of magma intrusion to hydrocarbon accumulation in the metamorphic zones. The results indicate that magma intrusion alters the mud shale of the Funing Formation, resulting in a circular metamorphic zone reservoir with enhanced reservoir properties. This reservoir exhibits two types of spaces, pores and fractures, with development dependent on the thickness and intensity of intrusive rocks. Magma intrusion also leads to a "ripening effect", increasing the Ro of mud shale by 0.4%-0.5% at the same depth. The intrusive rocks of the Funing Formation were formed during the Wubao to Sanduo periods. The intrusion of igneous rocks created a circular metamorphic zone prior to the hydrocarbon charging stage, indicating a favorable accumulation match. Influenced by magma intrusion, spatial distribution of intrusive rocks, and the source-reservoir relationship, the metamorphic zones of intrusive rocks and surrounding rocks in the second member of Funing Formation in the Qintong Sag exhibit characteristics of integrated source-reservoir and near-source enrichment. This presents a new opportunity for significant reservoir enhancement on a large scale.
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火山岩油气藏广泛分布于全球40余个盆地中，是油气勘探的重要领域之一[1-2]。中国陆上火山岩油藏分布广、层系多[3-5]，东部松辽、渤海湾、苏北等盆地火山岩领域勘探取得多点突破，已成为我国东部陆相盆地油气深化勘探和规模增储的重要领域[6-13]。苏北盆地火山活动受郯庐断裂的影响，火山岩在金湖、高邮、溱潼、海安凹陷广泛分布[14-19]。溱潼凹陷广泛发育岩浆侵入形成的辉绿岩，主要分布于古新统阜宁组二段—四段(图 1)，面积246 km2。早期QK117、CS241等21口探井见油气显示，多口井试获工业油流，并且初步建立了火山岩油藏模式[20]。然而，针对火山岩对泥页岩围岩储层及其成藏影响研究较少[21-23]，泥页岩围岩变质带能否作为勘探重点领域有待深入评价。近年来溱潼凹陷深凹带SD1、SD2钻井发现了阜二段侵入岩围岩中的变质泥岩油藏，储层物性与正常泥页岩储层相比得到明显改善，有机质成熟度得到明显提升。因此，笔者利用苏北盆地溱潼凹陷典型钻井取心、测井及分析化验资料，深入探讨岩浆侵入对泥页岩围岩储层特征及油气成藏影响，以期推动苏北盆地侵入岩围岩变质带新类型油藏勘探。
图 1 苏北盆地溱潼凹陷区域构造(a)、地震剖面(b)及综合地层特征(b)Figure 1. Regional structure(a), seismic profile(b) and comprehensive stratigraphic characteristics(c) of Qintong Sag, Subei Basin1. 地质概况
苏北盆地是在扬子地台中生界、古生界沉积层褶皱基底上发育起来的新生代盆地，呈“一隆两坳”构造格局，新生代以来受仪征、吴堡、三垛3期构造作用影响，经历了断坳、断陷、坳陷3个发展阶段，自下而上发育古近系泰州组、阜宁组、戴南组、三垛组、新近系盐城组以及第四系东台组(图 1)。区域构造活动期间伴随强烈的岩浆活动，形成大面积分布的以玄武岩为代表的喷发岩，还有大量侵入新生界中的侵入岩[13]。纵向上自泰州组至盐城组发育3期火山活动旋回：即泰州组—阜宁组火山活动旋回(Ⅰ)、戴南组—三垛组火山活动旋回(Ⅱ)和盐城组火山活动旋回(Ⅲ)，火山岩体总的趋势是沿主断裂带分布，叠合连片。
溱潼凹陷火山岩广泛分布于深凹带—斜坡带阜宁组、三垛组中，三垛组发育溢流相玄武岩，厚度0~10 m；阜宁组火山岩为浅层侵入的基性辉绿岩，厚度0~150 m，且分布面积广，其中夹持在阜二段烃源岩内部的辉绿岩主要位于深凹带沙垛—帅垛地区、斜坡带顾庄地区，分布面积超过63 km2。受岩浆侵入影响，阜二段泥页岩发生变质作用，特别是上蚀变带具备形成大规模接触变质带储集体，是新类型油藏勘探的重要目标。
2. 样品与实验方法
本次研究样品均采集自溱潼凹陷深凹带沙垛地区SD1、SD2井阜二段泥页岩及变质带岩心，SD1井样品系统开展了普通薄片、物性、主量元素、碳氧同位素和锆石定年分析，样品所处深度3 520~3 618.4 m。其中普通薄片实验和物性分析是在中国石化华东油气分公司勘探开发研究院实验中心完成，重点确定变质带储层岩石类型及物性变化特征；主量元素、碳氧同位素及锆石定年分析均在南京大学内生金属矿床成矿机制研究国家重点实验室内进行，前两者主要用于分析辉绿岩、变质带及正常泥页岩储层矿物及元素变化特征，而锆石定年主要是用于确定岩浆侵入时期与期次，为动态认识相关油藏提供基础。此外，为了进一步确定储集空间类型，还对SD2井3 140~3 151.5 m样品进行了氩离子抛光实验，相关实验在中国石化华东油气分公司勘探开发研究院实验中心完成，满足研究需要。
3. 泥页岩变质带储层特征
3.1 储层岩石学特征
溱潼凹陷深凹带钻探的SD1、SD2井钻遇的阜二段侵入岩主体为基性辉绿岩，长石含量60%，辉石含量40%，具辉绿结构；辉石轻微蚀变，长石开始发生绢云母化，长石发育裂理(图 2a)。阜二段原始沉积为一套暗色泥页岩，基性岩浆侵入形成的辉绿岩使得泥页岩围岩发生热接触变质作用，距离辉绿岩越近，泥页岩蚀变作用越强。变质带可分为中级变质带和低级变质带。其中，中级变质带紧邻侵入岩边缘，岩石褪色明显(图 2b)，蚀变作用较强，岩石类型属普通角闪石角岩相，大部分发生重结晶，多见堇青石，偶见红柱石、热液硅化脉(图 2c-f)；低级变质带岩石类型属钠长—绿帘角岩相，泥页岩重结晶程度较差，变余泥质结构清晰，发生绢云母化、绿泥石化，形成斑点角岩或瘤状角岩(图 2g，h)。
图 2 苏北盆地溱潼凹陷SD1井古新统阜宁组二段侵入岩及围岩岩石学特征Figure 2. Petrological characteristics of intrusive rocks and surrounding rocks of second member of Paleocene Funing Formation in well SD1 of Qintong Sag, Subei Basin岩浆侵入对岩体上部的蚀变程度明显强于下部，褪色显著，蚀变作用较强。从变质泥页岩主量元素对比分析来看(表 1)，越靠近侵入体，重结晶泥岩SiO2、Na2O、K2O含量明显降低，Al2O3、MgO、CaO含量提升明显，表明泥页岩受侵入岩热液蚀变后，易于遭受蚀变的含钾—钠的矿物(钾长石、伊利石等)发生物质流失，而Al2O3增加意味着黏土矿物增加，可能出现高岭土化。
表 1 苏北盆地溱潼凹陷SD1井古新统阜宁组二段侵入岩上变质带—泥页岩主量元素统计Table 1. Statistics of principal elements of mud shale in metamorphic zone of intrusive rocks of second member of paleocene Funing Formation, well SD1, Qintong Sag, Subei Basin% 样品深度(岩性) SiO2 TiO2 Al2O3 Fe2O3 MnO MgO CaO Na2O K2O P2O5 LOI 3 520 m(正常泥页岩) 65.79 0.235 6.79 3.28 0.190 1.12 9.56 0.77 0.82 0.138 12.23 3 522 m(正常泥页岩) 49.95 0.421 9.92 3.91 0.123 2.83 13.95 1.83 1.31 0.164 14.32 3 545 m(蚀变泥页岩) 58.03 0.742 16.84 7.11 0.000 0.11 1.63 9.24 2.58 0.127 3.59 3 546 m(蚀变泥页岩) 59.64 0.458 12.72 5.57 0.121 3.08 9.00 7.43 1.14 0.150 0.79 3 546.6 m(蚀变泥页岩) 45.48 0.227 15.47 3.16 0.210 3.74 26.77 0.28 0.02 0.236 4.70 3.2 储集空间特征
阜二段侵入岩围岩变质带储集空间类型多样，依据形成过程和几何特征，可将储集空间划分为孔隙、裂缝两大类。
受热蚀变影响，阜二段蚀变泥页岩储集空间与正常泥页岩差异较大，孔隙类型主要以粒间孔、溶蚀孔为主，岩心观察溶蚀孔洞直径2~10 mm(图 3a)，扫描电镜镜下显示粒间孔主要为矿物粒间孔隙，孔径平均5~10 μm，粒间孔内充填有机质(图 3b，c)；溶蚀孔主要为长石溶蚀孔(图 3d)。同时在变质带中上部发育少量有机孔(图 3e)，受侵入岩热液蚀变强度影响，有机孔主要分布于变质带中上部。
图 3 苏北盆地溱潼凹陷古新统阜宁组二段侵入岩围岩储集空间特征Figure 3. Reservoir space characteristics of intrusive rocks and surrounding rocks of second member of Paleocene Funing Formation in Qintong Sag, Subei Basin裂缝包括构造缝、冷凝收缩缝两类，其中构造缝是泥页岩固结成岩后在侵入体挤压作用下形成的缝隙。构造缝在本区普遍发育，规模为厘米—米级，一般成组出现，可相互切割，多为泥质、石英、方解石等半充填，局部开启(图 3f，g)。同时泥页岩围岩在热液作用下经脱水、变硬及有机质碳化加速成岩，并伴随矿物的扩散和重结晶作用，形成冷凝收缩缝(图 3h)，对储集空间的形成产生积极的影响。
SD1、SD2井覆压法实测阜二段泥页岩变质带基质孔隙度为9.12%~27.6%，中值17.2%，渗透率中值0.14×10-3 μm2，为中孔、特低渗储层(图 4)，但由于岩浆侵入影响，构造缝和冷凝收缩缝发育，储层渗透性增强，为变质带油气运聚和渗流提供了重要通道。
图 4 苏北盆地溱潼凹陷古新统阜宁组二段泥页岩变质带储层物性Figure 4. Physical properties of reservoirs in mud shale metamorphic zone of second member of Paleocene Funing Formation in Qintong Sag, Subei Basin3.3 测井响应特征
通过溱潼凹陷阜二段辉绿岩及围岩变质带岩心、薄片和测井资料综合分析，明确了辉绿岩及泥页岩变质带储层测井响应特征(图 5，图 6)。该区辉绿岩表现为明显的“两高两低”的测井响应特征：高电阻率值(RD)、高补偿密度值(DEN)(约为2.7 g/cm3)；低自然伽马值(GR)、低声波时差值(AC)，其响应范围分别为15~25 API、180~210 μs/m。变质带的储层测井响应特征与正常泥页岩及辉绿岩均不相同，表现为GR值一般高于辉绿岩体、高于或接近正常泥页岩；AC值明显高于辉绿岩体，低于正常泥页岩；DEN值降低(约为2.4 g/cm3)，自然电位曲线(SP)出现较大负异常，表明泥页岩变质带储层具有较好的物性；而电阻率值(RD)受岩浆侵入影响，越接近侵入岩体，蚀变作用越强，黏土矿物含量逐步增加，电阻率逐渐降低。综合分析认为，泥页岩变质带储层自然电位、声波时差与围岩和辉绿岩的界限较为明显。
图 5 苏北盆地溱潼凹陷沙垛地区古新统阜宁组二段不同岩性测井响应特征Figure 5. Relationship of response characteristics of different lithologies in second member of Paleocene Funing Formation in Shaduo area of Qintong Sag, Subei Basin
图 6 苏北盆地溱潼凹陷SD1井古新统阜宁组二段综合柱状图Figure 6. Comprehensive histogram of second member of Paleocene Funing Formation in well SD1 of Qintong Sag, Subei Basin4. 岩浆侵入对油气成藏贡献
溱潼凹陷阜宁组侵入岩的形成与分布与区域构造运动密切相关，火成岩侵入不仅改变了局部地温场，同时对局部储层的改造、油气运聚均具有重要影响[24-25]。
4.1 阜宁组侵入岩侵入期次
针对溱潼凹陷前期阜宁组侵入岩形成时期不清的问题，对SD1、B1、S4井进行了辉绿岩锆石、磷灰石定年研究，确定阜宁组侵入岩从吴堡期就已开始(54.3 Ma±1.15 Ma)(图 7)，一直持续到三垛期(33 Ma)，与区域吴堡构造运动具有密切联系。深凹带埋藏史分析显示，区域油气大规模成藏期为三垛组沉积末期—盐城组沉积期[26]，火成岩侵入形成环状变质带的时间早于油气充注期，具有良好的成藏匹配关系。
图 7 苏北盆地溱潼凹陷SD1井锆石年龄谐和图Figure 7. Zircon age harmony diagram of well SD1 in Qintong Sag, Subei Basin4.2 岩浆侵入具有“增储”作用
岩浆从侵位到结晶时散发出大量的热能烘烤围岩，形成围岩变质相带，改变围岩的储集性能。侵入岩变质带呈包壳状分布，平面与侵入岩分布范围一致，上变质带优于下变质带。溱潼凹陷已有钻井揭示，变质带储层发育程度受侵入岩控制，辉绿岩厚度越大，变质带储层越厚。遭受热流体作用的重结晶泥岩和侵入岩中，方解石碳同位素显著偏负(小于-13‰)，远远低于未受蚀变的上部正常泥页岩(大于0)(表 2)。同时离辉绿岩越近，泥岩蚀变越严重，孔隙更加发育(图 8)。深凹带沙垛地区SD1、SD2井钻遇上变质带储层厚度16~20 m，变质带储层孔隙度平均15%，是阜二段正常泥页岩孔隙度的3倍；此外，岩浆侵入形成的构造缝、冷凝收缩缝改善了储层渗透性，为阜二段源内侵入岩围岩变质带油藏提供了良好的储集空间。
表 2 苏北盆地溱潼凹陷SD1井侵入岩—变质带—正常泥页岩碳、氧同位素分析结果Table 2. C and O isotopes of intrusive rock, metamorphic zone and normal mud shale in well SD1 in Qintong Sag, Subei Basin样品深度/m 矿物 δ18OSMOW/‰ δ13CVPDB/‰ 备注 3 520.0 泥页岩中方解石 19.70 0.18 正常泥页岩 3 522.0 泥页岩中方解石 20.09 0.02 正常泥页岩 3 546.6 蚀变泥页岩中方解石 17.57 -16.66 上蚀变带 3 550.2 辉绿岩中方解石 16.04 -13.37 辉绿岩 3 587.8 橄榄辉长岩中方解石 15.78 -13.20 辉绿岩 3 595.5 橄榄辉长岩中方解石 17.03 -14.55 辉绿岩 3 618.4 热变质泥岩中方解石 19.79 -15.72 下蚀变带 
图 8 苏北盆地溱潼凹陷阜宁组侵入岩与变质带储层厚度、孔隙度相关性Figure 8. Correlation between reservoir thickness and porosity of intrusive rocks and metamorphic zones in Funing Formation, Qintong Sag, Suibei Basin4.3 岩浆侵入具有“催熟作用”
岩浆侵入能够形成局部异常高地温场，使烃源岩的生烃门限变浅，加速周围烃源岩的成熟演化，同时侵入岩浆中方沸石等矿物作为催化剂加速泥页岩生烃转化。溱潼凹陷阜二段是区域主力烃源岩，为深湖—半深湖沉积，TOC含量为0.5%~2%，平均1.32%，具有下低上高的特征；S1为0.2~8.7 mg/g，平均1.61 mg/g；有机质类型主要为Ⅱ型，部分为Ⅰ型和Ⅲ型[26-27]。SD1井阜二段样品实测分析表明，受侵入岩烘烤影响，同等深度下泥页岩Ro可增加0.4%~0.5%(图 6)。研究区SD2井变质带油藏地面原油密度0.846 g/cm3，气油比300~420 m3/t，运动黏度12.74 mm2/s，动力黏度11.03 mPa·s；而未受侵入岩烘烤变质影响的页岩油藏原油密度0.852~0.898 g/cm3，气油比40~80 m3/t，运动黏度34~53 mm2/s，动力黏度29~47 mPa·s，原油品质明显低于变质带油藏。
4.4 阜二段侵入岩围岩变质带富集特征
受岩浆多期侵入、侵入岩空间分布以及源储匹配关系控制，溱潼凹陷阜二段侵入岩围岩变质带油藏具有源储一体、近源富集特征(图 9)。阜二段侵入岩蚀变型圈闭面积63.8 km2，其中深凹带沙垛、帅垛地区处于成熟烃源岩分布区(Ro>0.8%)，阜二段烃源岩生成的油气就近短距离运聚至变质带优质储层，而正常泥页岩围岩为致密物性封闭体，是油气得以保存的重要条件，因此是目前规模增储首选目标，有利圈闭面积27.2 km2，地质资源量1 317×104 t；斜坡带中低演化区，受局部侵入岩侵入烘烤，烃源岩生烃门限降低，油气丰度可能稍低，是勘探接替重要区带。2022年优选深凹带沙垛地区部署的SD2井取得突破，泥岩蚀变带试获原油13.64 t/d，展现出良好的勘探潜力。
图 9 苏北盆地溱潼凹陷火山岩相关油藏成藏模式Figure 9. Accumulation model of volcanic-related oil reservoirs in Qintong Sag, Subei Basin5. 结论
(1) 苏北盆地溱潼凹陷阜二段受岩浆侵入影响，泥页岩围岩发生蚀变形成环状变质带储层，发育孔隙、裂缝两类储集空间，通过自然电位、声波时差曲线可区分变质带储层、正常泥页岩及辉绿岩体。
(2) 岩浆侵入具有“增储作用”，变质带储层孔隙度平均15%，是阜二段正常泥页岩孔隙度的3倍。岩浆侵入具有“催熟作用”，受侵入岩烘烤影响，同等深度下泥页岩Ro可增加0.4%~0.5%，变质带油藏原油品质明显优于正常页岩油藏。
(3) 阜宁组侵入岩形成于吴堡期—三垛期，火成岩侵入形成环状变质带的时间早于油气充注期，具有良好的成藏匹配关系。受岩浆侵入、侵入岩空间分布以及源储匹配关系控制，溱潼凹陷阜二段辉绿岩围岩变质带具有源储一体、近源富集特征，是规模增储的新阵地。
利益冲突声明/Conflict of Interests作者声明不存在利益冲突。The author discloses no relevant conflict of interests.作者贡献/Authors’Contributions论文由臧素华独立完成。臧素华已阅读并同意最终稿件的提交。The manucript was drafted and revised by ZANG Suhua, and he has read the last version of paper and consented for submission. -
图 1 苏北盆地溱潼凹陷区域构造(a)、地震剖面(b)及综合地层特征(b)
Figure 1. Regional structure(a), seismic profile(b) and comprehensive stratigraphic characteristics(c) of Qintong Sag, Subei Basin
图 2 苏北盆地溱潼凹陷SD1井古新统阜宁组二段侵入岩及围岩岩石学特征
Figure 2. Petrological characteristics of intrusive rocks and surrounding rocks of second member of Paleocene Funing Formation in well SD1 of Qintong Sag, Subei Basin
图 3 苏北盆地溱潼凹陷古新统阜宁组二段侵入岩围岩储集空间特征
Figure 3. Reservoir space characteristics of intrusive rocks and surrounding rocks of second member of Paleocene Funing Formation in Qintong Sag, Subei Basin
图 4 苏北盆地溱潼凹陷古新统阜宁组二段泥页岩变质带储层物性
Figure 4. Physical properties of reservoirs in mud shale metamorphic zone of second member of Paleocene Funing Formation in Qintong Sag, Subei Basin
图 5 苏北盆地溱潼凹陷沙垛地区古新统阜宁组二段不同岩性测井响应特征
Figure 5. Relationship of response characteristics of different lithologies in second member of Paleocene Funing Formation in Shaduo area of Qintong Sag, Subei Basin
图 6 苏北盆地溱潼凹陷SD1井古新统阜宁组二段综合柱状图
Figure 6. Comprehensive histogram of second member of Paleocene Funing Formation in well SD1 of Qintong Sag, Subei Basin
图 7 苏北盆地溱潼凹陷SD1井锆石年龄谐和图
Figure 7. Zircon age harmony diagram of well SD1 in Qintong Sag, Subei Basin
图 8 苏北盆地溱潼凹陷阜宁组侵入岩与变质带储层厚度、孔隙度相关性
Figure 8. Correlation between reservoir thickness and porosity of intrusive rocks and metamorphic zones in Funing Formation, Qintong Sag, Suibei Basin
图 9 苏北盆地溱潼凹陷火山岩相关油藏成藏模式
Figure 9. Accumulation model of volcanic-related oil reservoirs in Qintong Sag, Subei Basin
表 1 苏北盆地溱潼凹陷SD1井古新统阜宁组二段侵入岩上变质带—泥页岩主量元素统计
Table 1. Statistics of principal elements of mud shale in metamorphic zone of intrusive rocks of second member of paleocene Funing Formation, well SD1, Qintong Sag, Subei Basin
% 样品深度(岩性) SiO2 TiO2 Al2O3 Fe2O3 MnO MgO CaO Na2O K2O P2O5 LOI 3 520 m(正常泥页岩) 65.79 0.235 6.79 3.28 0.190 1.12 9.56 0.77 0.82 0.138 12.23 3 522 m(正常泥页岩) 49.95 0.421 9.92 3.91 0.123 2.83 13.95 1.83 1.31 0.164 14.32 3 545 m(蚀变泥页岩) 58.03 0.742 16.84 7.11 0.000 0.11 1.63 9.24 2.58 0.127 3.59 3 546 m(蚀变泥页岩) 59.64 0.458 12.72 5.57 0.121 3.08 9.00 7.43 1.14 0.150 0.79 3 546.6 m(蚀变泥页岩) 45.48 0.227 15.47 3.16 0.210 3.74 26.77 0.28 0.02 0.236 4.70 
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表 2 苏北盆地溱潼凹陷SD1井侵入岩—变质带—正常泥页岩碳、氧同位素分析结果
Table 2. C and O isotopes of intrusive rock, metamorphic zone and normal mud shale in well SD1 in Qintong Sag, Subei Basin
样品深度/m 矿物 δ18OSMOW/‰ δ13CVPDB/‰ 备注 3 520.0 泥页岩中方解石 19.70 0.18 正常泥页岩 3 522.0 泥页岩中方解石 20.09 0.02 正常泥页岩 3 546.6 蚀变泥页岩中方解石 17.57 -16.66 上蚀变带 3 550.2 辉绿岩中方解石 16.04 -13.37 辉绿岩 3 587.8 橄榄辉长岩中方解石 15.78 -13.20 辉绿岩 3 595.5 橄榄辉长岩中方解石 17.03 -14.55 辉绿岩 3 618.4 热变质泥岩中方解石 19.79 -15.72 下蚀变带
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