油气由凹陷区断裂输导向斜坡区砂体输导转换部位预测方法

Methodology for predicting transfer position of oil and gas transmission from fault in depression to sand body in slope area

关键词:  凹陷区  断裂输导  斜坡区  砂体输导  转换部位  预测方法

Key words:  depression area  fault transporting oil and gas  slope area  sand body transporting oil and gas  conversion position  prediction method

摘要:

为了研究含油气盆地油气分布规律,在油气由凹陷区断裂输导向斜坡区砂体输导转换条件及部位研究的基础上,通过确定油源断裂分布区和源岩排烃分布区来确定凹陷区断裂输导油气分布区,通过确定连通砂体分布区和砂体输导油气优势路径分布区来确定斜坡区砂体输导油气分布区,二者叠合建立一套油气由凹陷区断裂输导向斜坡区砂体输导转换部位的预测方法,并将其应用于海拉尔盆地贝尔凹陷苏德尔特地区南一段上部油气由凹陷区断裂输导向斜坡区砂体输导转换部位的预测。结果表明:苏德尔特地区南一段油气由凹陷区断裂输导向斜坡区砂体输导转换部位主要分布在中部地区,其南部和中部为线状接触转换部位,有利于油气由凹陷区断裂输导向斜坡区砂体输导转换,易在斜坡区形成大规模油气聚集；北部为带状未接触转换部位,不利于油气由凹陷区断裂输导向斜坡区砂体输导转换,不宜在斜坡区形成大规模油气聚集,与目前苏德尔特地区斜坡区南一段上部已发现油气分布相吻合,表明该方法用于预测油气由凹陷区断裂输导向斜坡区砂体输导转换部位是可行的。

Abstract:

In order to study the distribution of oil and gas in petroliferous basins, on the basis of transfer conditions and positions of the fault transport to the sand body in the slope area, the distribution area of the fault transport oil and gas in the depression area is obtained by determining the distribution area of the oil source fault and the hydrocarbon expulsion area of the source rock.The distribution area of the fault transport oil and gas in the depression area is obtained by determining the distribution area of the connected sand body and the distribution area of the dominant path of the possible sand body transport oil and gas. The distribution area of oil and gas transportation is obtained by determining the distribution area of connected sand body and the distribution area of the dominant path of oil and gas transportation of possible sand body, and the distribution area of oil and gas transportation of sand body in slope area. A set of prediction methods for the transfer position of fault oil and gas transportation to sand body in slope area are established by combining the two, and are applied to the upper part of the south first member of the depression area in the Sudeerte area, Beier depression, Hailar Basin. The results show that the upper part of the south part of the sag in the Sudeerte area is mainly distributed in the middle part of the slope area. The middle part and the south part are in linear contact, which is conducive to the transfer of oil and gas from the sag to the slope area, and is easy to form in the slope area. It is not suitable to form a large-scale sand body transporting oil and gas accumulation in the slope area due to large-scale sand body transporting and transferring, which is consistent with the distribution of oil and gas found in the upper part of the south section of the slope area in the Sudeerte area at present time, which indicates that this method is feasible to predict the transporting and transferring position of fault transporting oil and gas to the sand body in the slope area.