宁夏东南部九彩坪地区油气地球化学特征

Geochemical characteristics of oil and gas in Jiucaiping area in southeast Ningxia Hui Autonomous Region

宁夏东南部九彩坪一带土壤中酸解烃(酸解甲烷、酸解乙烷、酸解丙烷)与酸解氢有较高的相关,但与汞的相关程度较低,酸解烃及酸解氢为向左倾斜的单峰分布形式,其中酸解氢及酸解烃呈现出正态分布特征,热释汞呈对数正态分布特征;平面上,酸解氢及酸解烃异常呈环状,热释汞呈北西-南东向带状分布,汞呈带状分布的特点可能是断裂构造的反映.九彩坪及以北地区,各项指标组合好,应是油气勘查的首选地段.

In southeast Ningxia some acid-deco acid-decomposed hydrocarbons in soil of Jiucaiping area which include methane, acid-decomposed ethane and acid-decomposed propane have good correlation with some others, and with acid-deco mposed hydrogen. But these components have low mutuality with mercury. The concentration distribution of these acid-decomposed methane, acid propane in the soil shows single apex and left-sloped in one diagram. When eliminating the high concentration samples, the rest shows a lognormal distribution characteristic. The concentration of the heat-released mercury also takes on a lognormal distribution characteristic. Palmary, the abnormity of acid-decomposed hydrogen and acid-decomposed hydrocarbons looks to be annular while the heat-liberated mercury displays a northwest to southeast belt. There may be two explanations to the abnormity of acid-decomposed hydrogen. Besides the aciddecomposed hydrocarbons, there must be other interpretations. The distribution of mercury has nothing with the structure. hydrocarbons, but the belt distribution may reflect the rupture