构造圈闭内沙四段产状平缓，储集层累计厚度大，含气丰度高。
The reservoir is thick with gentle occurrence and high gas abundance.
牛庄洼陷东坡沙四段是2004年以来发现的一套新的含油层系。
The forth segment of Shahejie formation(ES_4) is a new oil-bearing series found in the east slope of Niuzhuang Sag since 2004.
从构造及沉积背景出发，分析了惠民凹陷西部沙四段油气的成藏条件。
According to tectonic and sedimentary characteristics, the petroleum reservoir forming conditions of the fourth member of Shahe-jie Formation in the west Huimin Depression are discussed.
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