正向构造

严格划分盆地内二级正向构造单元的地质意义&以渤海海域为例

The Significance to Strict Division of Sub-tectonic Unit in Bohai Basin

隆起构造是沉积盆地内的大型正向构造单元，是油气聚集的主要场所。

Uplift structure is the large-scale positive structural unit in the sedimentary basin . It is the main place for oil and gas accumulation .

正向构造一般分布在顺扭减张区。利用这种构造分布模式，在张扭性边界大断层上盘可准确预测和发现各类地质构造，提高油气勘探的成功率。

This structural distribution pattern allows prediction and discovery of various geological structures at the upthrow side of a tension - torsional boundary fault , thus raising the success rate of hydrocarbon exploration .

新生代发生的强烈的喜山运动，促使盆地内部各一、二级正向构造单元进一步冲断上隆、甚至生长为盆内山脉，对古油气藏保存不利。

Occurred in the Neozoic , the strong Himalayan movement made the first order and the second order structure units uplift to form maintains in the basin , which are unfavorable to preserve oil and gas .

微构造研究表明，剩余油的分布主要在几种正向构造单元中：具构造高点的含油小断块、小高点和小鼻状构造的凸起部位。

Based on micro tectonics study , it has been proved that the distribution of remaining oil exist in several heaves , such as little oil block with high focus , small convex , and little heave of nose formation .

共包括六个负向构造单元（东北凹、北凹、中凹、西凹、南凹、东凹）和三个正向构造单元（北凸、西凸、南凸）。

It included six minus structural units ( Northeast concave , north concave , middle concave , west concave , south concave , east concave ) and three plus structural units ( north protruding , west protruding , south protruding ) .

并对微型构造类型进行了研究，主要微型构造类型为正向微构造、负向微构造和斜面微构造。

On the study of structural type , positive microscopic structural , negative microscopic and oblique microscopic structural are taken as the main microscopic structural types .

在确定加密井井别时，应尽可能地把生产井钻在正向微构造区，把注水井钻在负向微构造区。

In the designing of well locations , according to mini-structure , infill wells should be drilled on the positive mini-structure areas and only injection wells are drilled in the negative mini-structure areas .

结果表明：构造高部位和正向微构造含油性好，累油高，含水上升慢；

It is shown that , the high positions of the structure and positive microstructures have good oil reserving capacity , cumulative oil production is higher and water cut increases at a lower rate ;

本文研究的主要认识在于：①研究区储层构造简单，为一平缓的西倾单斜，区内构造活动微弱，仅有局部发育一些微构造，而正向微构造很有可能形成剩余油富集。

The conclusions obtained in this thesis can be summarized as follows : ( 1 ) The reservoir structure in the studying area is simple , being chiefly the gentle west-dip monocline with a low tectonic intensity , there are only mini structures in the studying area .

正向油层微构造和断层形成的微构造为剩余油富集区。

The positive micro structures of oil reservoir and fault are the area where residual oil is concentrated .

渤海海域两个石油地质储量超亿吨的大型油气田均发现于凸起或低凸起之上，说明正向二级构造单元具有明显的成藏优势。

In Bohai Bay , two major oil gas fields with in place reserve over 100 million ton were discovered in uplift or low uplift , which suggests that secondary positive structures in the Bay have obvious superiority in hydrocarbon accumulation .