粗面岩

通过K-Ar同位素年代学研究，将长江源区新生代的火山活动划分为3期：第Ⅰ期（40.1～35.1Ma）火山喷发较弱，形成小范围分布的细粒安粗岩和斑状粗面岩；

Based on K-Ar isotope chronological research , Cenozoic volcanism in the source region of the Yangtze River is divided into three phases . In the first phase ( 40.1-35.1 Ma ) volcanism was weak , forming fine-grained latite and porphyritic trachyte of limited distribution .

含矿主岩主要为粗面岩，具有独特的麻子构造；

The main host rock is trachyte with distinctive pockmark structure .

赣杭带早白垩世粗面岩锆石SHRIMPU-Pb年龄及其意义

Early Cretaceous Zircon SHRIMP U-Pb Age of the Trachyte and Its Significances of the Gan-Hang Belt

相反，w（SiO2）>54.4%的粗安岩、粗面岩和粗面英安岩可能来自陆壳或经历了壳内分异作用。

On the contrary , the trachytes and trachyandesites , with SiO_2 > 54.4 % , were likely to be resulted from the crust or related to intracrustal differentiation .

确认本区优质粗面岩储层主要分布于构造破碎带上，厚度在20～200m之间。

It was considered that the advantageous reservoir were mainly distributed on tectonic broken belt , the thickness was between 20 ~ 200 meters .

粗面岩储集层录井评价方法

Mud logging evaluation method for trachyte reservoir

岩石类型主要有钾玄岩、安粗岩、粗面岩、橄榄粗安岩、英安岩和流纹岩。

The rocks include shoshonite , latite , trachyte , mugearite , dacite and rhyolite .

火山岩储层岩性为粗面岩，孔隙结构复杂，储集空间以裂缝为主；

The reservoir lithology was trachyte , pore structure was complex , and main reservoir space was fractures .

粗面岩的同位素组成和玄武岩接近，说明粗面岩是玄武质岩浆分离结晶作用形成的。

Trachyte has the same isotopic compositions as the basalts , implying that it is generated by fractional crystallization .

经岩石力学分析，玄武岩抗压强度最大，粗面岩抗压强度相对较弱。

Through rock mechanics analysis , basalt has the most compression strength , while that of trachyte is relatively weaker .

粗面岩、响岩、粗玄岩，含钾泥灰岩、钾长浅粒岩等尚待开发利用。

The trachyte , phonolite , dolerite , K-bearing marl , K-feldspar leptite etc are to be exploited and utilized .

火山岩主要岩石类型为粗安岩，少量粗面岩、玄武粗安岩、白榴石玄武粗安岩；

The main rock type of the volcanic rock is trachyandesite with small amounts of trachyte , basaltic-trachyandesite and leucite basaltic-trachyandesite .

该结果对辽河油田小龙湾地区粗面岩油气藏的压裂设计和油气田开发具有重要的指导意义和参考价值。

The results will play an important role in guiding fracture design and reservoir exploitation of trachyte reservoir in Xiaolongwan area .

利用波形理论和人工神经网络方法对粗面岩储层平面含油气情况进行预测。

Also , oil and gas bearing conditions of same area are predicted with wave form concept and artificial nerve network .

辽河油田粗面岩油气藏比较发育，但储集层的均质性较差，增加了对其评价的难度。

Trachyte reservoir of Liaohe Oilfield are fairly developed , but its homogeneity is poor , thus adding difficulties to the evaluation .

粗面岩和粗面英安岩Eu/Eu平均0.59，低于上陆壳平均值0.65；

Eu / Eu ~ values in trachytes average 0.59 , lower than 0.65 which is supposed as average of upper continental crust .

玄武质岩浆在演化过程中可能经历了辉石、斜长石、钛铁矿、磷灰石等矿物的分离结晶作用后形成了粗面岩。

Basaltic magma may have experienced the fractional crystallization of pyroxene , plagioclase , ilmenite , apatite and other minerals to form trachyte .

碱性岩的岩性组合主要以灰黑色粗面岩为主、并含有角砾熔岩，正长斑岩、正长细晶岩等。

Alkaline rocks in the area are mainly composed of gray-black trachyte , and some breccia lava , syenite porphyry and syenite aplite .

除少量的高钾流纹岩、粗面岩和粗面英安岩外，在数量和分布上以普遍含二辉石斑晶的安粗岩占优势。

Excepting a few high-K 2O rhyolite , trachydacite and trachyte , latites commonly having clino and orthopyroxenes phenocrysts are superior in quantity and distribution .

截至目前，在整个东部凹陷取得了火成岩勘探的重大突破，发现了粗面岩、辉绿岩油藏。

Up to the present , the important breakthrough has been made in entire volcanic rocks in eastern area , discovering trachyte and dolerites oil reservoirs .

以洱海断裂带为界，东侧主要为基性、超基性岩，西侧主要为粗面岩。

With the Erhai fault zone as a boundary , they are mainly basic and ultrabasic rocks in the east side , trachyte in the west side .

火山岩中流纹岩和熔结凝灰岩的孔隙度、渗透率一般较高，玄武岩、安山岩、粗面岩和凝灰岩的孔隙度、渗透率略低。

The porosity and permeability of rhyolite and self-fused tuff in lava are generally higher , while they are lower in basalt , andesite , trachyte and tuff .

其中，流纹岩是该区主要的火山岩岩类，其次是粗面岩和安山岩，总体表现为酸性喷出岩为主。

Of these , rhyolite is the major volcanic rocks in the area , followed by trachyte and andesite , the overall performance of mainly acidic extrusive rock .

四川宝兴黄店子富钾粗面岩，是目前国内外已知含氧化钾最高的粗面岩之一。其氧化钾含量已达含钾岩石作为钾肥原料的富矿标准。

The potassium ich trachyte in Huangdianzi , Baoxing county , Sichuan province , is one of the high K content rocks known in our country and abroad .

长江源区新生代火山岩的演化特征为：从早到晚，岩石系列由高钾钙碱性系列→钾玄岩系列演化；岩性由安粗岩→粗面岩演化。

From early to late , the Cenozoic volcanic rocks in the source region of the Yangtze River evolved from high-potassium calc-alkaline series to shoshonite series and from latite to trachyte .

该区火山岩岩石类型有熔岩（以粗面岩为主）、火山碎屑岩两大类，其成因主要是大陆环境，以岩浆分异结晶占主导地位，部分熔融占次要地位；

Lava ( mainly trachyte ) and igneous clastic rock are the two main types which are of continental environment with magma iso crystalization taking the domination role and melting as the secondary .

可划分出南北2个火山岩带，南带以中性岩为主，北带粗面质火山岩增多。

The south and north belts may be distinguished : the south belt is dominated by intermediate rocks , while trachytic pyroclastic rocks increase in the north belt .

结果表明，火山岩的岩石类型为玄武粗安岩、粗面安山岩、英安岩及粗面岩，属钙碱性岩石系列；

The results show that the volcanic rocks , including basaltic trachyte , trachyandesite , trachyte and dacite , belong to calc-alkaline series .