PROSPECT FOR CHINA‘S PETROLEUM INDUSTRY

Many people show concerns over the prospect forChina‘s petroleum industry.They may raise the question about whether the country‘s resources are on the brink of exhaustion. Such questions should be answered only by the exploration results because petroleum production is based on the reserves.……     

REVIEW AND OUTLOOK IN PETROLEUM EXPLORATION IN JUNGGAR BASIN

ＲＥＶＩＥＷＡＮＤＯＵＴＬＯＯＫＯＮＰＥＴＲＯＬＥＵＭＥＸＰＬＯＲＡＴＩＯＮＩＮＪＵＮＧＧＡＢＡＳＩＮＺｈａｎｇＧｕｏｊｕｎ（ＰｒｏｆｅｓｓｏｒｏｆＥｎｇｉｎｅｅｒｉｎｇ，ＰｅｔｒｏｌｅｕｍＧｅｏｌｏｇｙ，ＸｉｎｊｉａｎｇＰｅｔｒｏｌｅｕｍＡｄｍｉｎ...     

PALEOZOIC CONTOURITE AND ITS HYDROCARBON－BEARINGPR OPERTYOF MANGAR SAG INTARIM BASIN

ＰＡＬＥＯＺＯＩＣＣＯＮＴＯＵＲＩＴＥＡＮＤＩＴＳＨＹＤＲＯＣＡＲＢＯＮ－ＢＥＡＲＩＮＧＰＲＯＰＥＲＴＹＯＦＭＡＮＧＡＲＳＡＧＩＮＴＡＲＩＭＢＡＳＩＮＷａｎｇＲｅｎｄｅ（ＳｅｎｉｏｒＥｎｇｔｎｅｅｒ，ＰｅｔｒｏｌｅｕｍＧｅｏｐｈｙｓｉｃａｌＰｒｏｓｐ...     

GEOLOGIC CHARACTERISTICS OF LATITUDINAL HYDROCARBON ABUNDANCE ZONES IN CHINA CONTINENTL

By analsis of the plate tectonics,basinal origin and geologic ages of major reservoirs,petrolifer-ous basins in China continent can be classified as longitudinal basin zone represented by Yilan-Yitong-Bo-hai Bay-Jianghan basins and latitudinal basin zone by Junggar-Erlian-Songliao basins.The two zonesare entitled to be called“Golden Zone”respectively for their having a great advantage in China’s crude re-serves and output.This paper is devoted to features of the latitudinal oil-rich zone by research of Bohai Baybasin and Songliao basin that belong separately to the longitudinal and latitudinal zones,followed by makinga correlation between the zones and petroliferous structural of two types or three sorts.It is concludedthat northwest China will be in a dominant position of China continent petroleum development strategies inthe future,and it is possible to disclose giant oil/gas fields in hinterland of Junggar basin.     

SEISMIC EVENTS IN THE UPPER MIOCENE – PLIOCENE SEDIMENTARY SUCCESSION IN THE GULF OF İZMİR (WESTERN ANATOLIA): IMPLICATIONS FOR HYDROCARBON PROSPECTIVITY

An analysis of multi-channel seismic reflection data integrating reflection tomography, pre-stack depth migration, AVO analysis, seismic modelling and seismic attribute analysis was used to investigate the Miocene – Quaternary stratigraphy of the Gulf of İzmir, western Anatolia. In this area, the east-west oriented Gediz graben intersects with the NE-SW oriented Bakırçay Graben. A velocity-depth model together with pre-stack depth migration allowed two seismic stratigraphic units (SSU1 and SSU2) to be distinguished. These units can be correlated with the stratigraphic succession at the offshore Foça-1 well and correspond to the Upper Miocene to Recent Bozköy, Ularca and Bayramiç Formations with a combined thickness of 1.75 km. The units rest on acoustic basement (SSU3) which has a basin-and-ridge morphology, and which corresponds to the Lower-Middle Miocene Yuntdağ Volcanics. A number of lateral velocity variations were identified. In particular, a ~90 m wide and ~500 m long lenticular-shaped low-velocity zone with an interval velocity of 1.68 km/s was identified in the Quaternary Bayramiç Formation. The structure is bounded by negative reflections whose amplitude increases with offset at the top and by strong positive reflections whose amplitude increases with offset at the base, interpreted as possible bright and flat spots respectively. These amplitude events point to the presence of gas-saturated sediments within the study area. The lenticular structure is bounded by strike-slip faults on either side, and by a Miocene – Pliocene unconformity surface below and by shales of the Bayramiç Formations above. It is therefore interpreted as a possible structural – stratigraphic trap. The strike-slip faults may allow the migration of hydrocarbons from source rocks located at greater depths. The presence of a low-velocity zone above the lenticular structure reaching up to seafloor may indicate the upward leakage of hydrocarbons from the trap. These observations will contribute to future hydrocarbon exploration activities in the study area.     

塔里木盆地不整合油气藏的成藏条件及分布规律

塔里木盆地削截不整合油气藏和超覆不整合油气藏都很发育,且具有产量高、分布广、规律明显等特点。它的形成既受不整合类型、圈闭及其形成期与油气运聚期匹配的控制,又受生、储、盖组合及配套断裂发育状况的制约。成藏期前形成的不整合圈闭有利于捕获油气,重建封闭作用有利于晚期成藏。古隆起、古斜坡的削截不整合尖灭带及超覆不整合带内是寻找不整合油气藏的最佳地带     

塔里木盆地反转构造与油气聚集

塔里木盆地从震旦纪至今经历了多期次的构造运动，包括挤压逆冲运动和伸展运动，但以前者为主。这两种运动在盆地演化中至少有两次更替，前中生代的挤压逆冲运动在中生代变为伸运动，至新生代又被挤逆冲运动所代替。这两种运动的交替变化就产生了负反转构造和正反转构造。     

塔里木盆地油气资源及勘探方向

近年来,塔里木盆地的生油研究取得很大进展,根据塔里木盆地烃源岩分布和成熟度研究的结果,作者主要讨论了以下几个问题：①塔里木盆地总资源量可能略低于以前的估算,并且减少的可能只是原油资源量;②塔里木是一个富含天然气的盆地,富气的根本原因是三套烃源岩中两套源岩在晚近期以生气为主;③烃源岩的分布和成熟度决定了台盆区的勘探重点是中、西部地区;④侏罗系源岩是塔里木盆地成为大气区的重要物质基础,应加强在北、西、南方向环绕塔里木盆地以侏罗系为源岩的勘探     

塔里木盆地构造特征与油气聚集规律

塔里木盆地是一个由古生界克拉通盆地和中、新生界前陆盆地组成的大型叠合复合盆地,具有古老陆壳基底和多次沉降隆升的复杂构造演化历史。古生界油气聚集受克拉通古隆起和斜坡构造控制,中、新生界油气聚集受喜马拉雅期逆冲构造控制。此外油气分布还受油气系统、区域盖层、断裂及不整合等因素控制。盆地具有多套烃源岩、多个油气系统、多套储盖组合、油气多源多期多种类型的特点。储集层条件好、天然气资源丰富和整体勘探程度低是在盆地进行油气勘探时不可忽视的三个特点。塔里木盆地已成为我国三大天然气区之一,油气勘探前景广阔     

塔里木盆地油气勘探若干地质问题

从塔里木盆地演化的特殊性入手,分析了克拉通盆地的活动性和前陆盆地的再生特点;通过油源对比认为,塔里木盆地是我国唯一在下古生界找到海相成因工业性油藏（而不仅是气藏）的地区,提出了海相油藏“多期成藏,晚期保存”的观点;并对塔里木盆地油气资源气多于油作了总体估计;分析了前陆区和台盆区寻找大油气田的主要难点,指出非构造圈闭勘探和碳酸盐岩储集层预测是制约台盆区油气勘探的两大因素;强调塔里木盆地寻找大油气田的努力要坚持下去     

塔里木盆地巴楚凸起构造特征及其对油气藏分布的控制

巴楚凸起是塔里木盆地西南部重要的油气勘探区。巴楚凸起经历了加里东、海西、印支－燕山和喜马拉雅等多期构造运动,其中海西和喜马拉雅运动对其油气藏形成十分重要。通过对其构造发育史、构造单元和断裂体系的详细研究,认为,巴楚凸起油气分布以复式油气藏为主体,其形成与断裂、储集岩体、不整合面三个基本因素的相互配合有关;断裂不仅控制着圈闭的形成、油气的运移,而且在一定程度上改善了储集层的物性     

塔里木盆地天然气碳,氢同位素成因分类及其分布规律

根据天然气碳、氢同位素组成特征，将塔里木盆地天然气划分为海相成因天然气，陆相成因天然气和海陆相混合气三大类。海相天然气分布在满加尔古生界海相生油气凹陷的南北两侧，塔中隆起和塔北隆起以南；陆相天然气分布在库车中生界陆相生油气坳陷及塔北隆起以北；海陆相混合气分布在塔北隆起中段雅克拉构造和东河塘部分井、巴什托普背斜群５井（Ｃ）中。柯克亚背斜天然气来源比较复杂，以陆相煤型气为主，可能混有海相油气。     

塔里木盆地多期不整合面的控油前景

塔里木盆地断裂及局部构造不发育,反映了盆地的稳定性与持续沉降的特点,这对生油岩的保存有利,但对油气的输导与聚集则不利。为扩大油气勘探成果,还应重视不整合面对油气的输导与控制作用。在主要的5期不整合面中,削截不整合、多期不整合叠合带及多期地层尖灭密集带、前陆盆地中因沉积作用引起的迁移渐进不整合带,是油气聚集前景的有利区带。     

塔里木阿瓦提前陆盆地构造特征及油气远景

阿瓦提前陆盆地位于塔里木盆地西北部。在新生代柯坪山脉以北东向的沙井子断裂为主滑面剧烈向南东方向逆冲,在沙井子断裂南东侧沉积了巨厚的新生代地层,且向南东方向急剧减薄,形成典型的不对称挠曲沉积盆地,这种盆地是大陆板块碰撞形成陆相盆地后,再次发育在造山带前缘的前陆盆地,它发育的大地构造位置和时间以及成因与周缘前陆盆地和弧后前陆盆地均不相同,可称之为陆内前陆盆地。阿瓦提前陆盆地具有良好的含油气远景,可进一步划分为三个油气聚集区带：沙井子断裂油气聚集带、阿恰断裂油气聚集带、阿瓦提前缘隆起（乌鲁桥—阿拉尔）构造油气聚集带。其中沙井子断裂带是阿瓦提前陆盆地中含油气远景最好的区带     

塔里木盆地不整合类型及其与油气藏的关系

塔里木盆地经历了多期构造运动的改造，共形成了三大类，六个亚类的不整合。这些不整合面（带）是油气良好的运移通道和有利的聚集场所，它们对下伏地层的储集性能有很大的改造作用，同时它们对早期油气藏又具破坏作用。另外，它们还具重建封闭作用，有利于晚期成藏。不整合类型的差异性、继承性和迁移性控制油气藏的形成、演化和分布。断褶不整合和褶皱不整合是最有利的控油不整合。